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学者姓名：李强
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Abstract ：
In this work, the evolution of microstructure and mechanical properties and the grain refinement law of polycrystalline pure tin (99.99%) under different rolling processes were studied, which was expected to lay a theoretical foundation for adjusting and optimizing the strengthening and toughening properties of pure tin. The results show that different rolling processes have obvious effects on the microstructure and properties of pure tin. The process of twin excitation and twin induced recrystallization in the deformation process are realized by regulating the factors of temperature, speed and path in the rolling process, in which the rolling speed is the most important factor. The grain refinement mechanism of rolling process is as follows: 60 degrees<100> deformation twins are induced at the initial stage of deformation, and the twins gradually evolve into recrystallized banded structure and divide and refine grains in the subsequent deformation process. Recrystallized grains and twins usually randomize the texture and therefore weaken the concentrated texture produced by the original coarse grain. Rolling deformation can significantly increase the strength of pure tin. The yield strength and tensile strength in TD direction are significantly higher than that in RD direction under unidirectional rolling.
Keyword ：
anisotropy anisotropy grain refinement grain refinement pure tin pure tin rolling rolling twinning twinning
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| GB/T 7714 | Cheng Sang , Zhang Yonggan , Wang Bingshu et al. Effects of Different Rolling Processes on Microstructure and Properties of Pure Tin [J]. | RARE METAL MATERIALS AND ENGINEERING , 2023 , 52 (1) : 206-214 . |
| MLA | Cheng Sang et al. "Effects of Different Rolling Processes on Microstructure and Properties of Pure Tin" . | RARE METAL MATERIALS AND ENGINEERING 52 . 1 (2023) : 206-214 . |
| APA | Cheng Sang , Zhang Yonggan , Wang Bingshu , Deng Liping , Zhou Baoxue , Li Qiang . Effects of Different Rolling Processes on Microstructure and Properties of Pure Tin . | RARE METAL MATERIALS AND ENGINEERING , 2023 , 52 (1) , 206-214 . |
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Abstract ：
本工作系统研究多晶纯锡(99.99%)在不同轧制工艺下的显微组织演变和力学行为，阐明纯锡在不同轧制状态下晶粒细化规律，以期为调控与优化纯锡的强韧化奠定理论基础。研究结果表明，不同轧制工艺对纯锡的微观组织和力学性能影响明显，其中轧制速度是影响纯锡的晶粒细化和力学性能提升的最主要因素，温度、速度和路径通过调控变形过程中的孪晶激发以及孪晶诱导再结晶的进程而实现不同工艺下的晶粒细化。轧制过程晶粒细化机制为：变形初期诱发60°<100>形变孪晶，在后续变形过程中孪晶逐渐演变为再结晶条带状组织，分割细化晶粒，且孪晶和再结晶组织的随机取向弱化原始粗晶产生的集中织构。轧制变形能明显提高纯锡的强度，且单向轧制工艺下的纯锡样品的TD方向的屈服强度和抗拉强度明显高于RD方向。
Keyword ：
各向异性 各向异性 孪生 孪生 晶粒细化 晶粒细化 纯锡 纯锡 轧制 轧制
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| GB/T 7714 | 程桑 , 张勇敢 , 汪炳叔 et al. 不同轧制工艺对纯锡微观组织与性能的影响 [J]. | 稀有金属材料与工程 , 2023 , 52 (01) : 206-214 . |
| MLA | 程桑 et al. "不同轧制工艺对纯锡微观组织与性能的影响" . | 稀有金属材料与工程 52 . 01 (2023) : 206-214 . |
| APA | 程桑 , 张勇敢 , 汪炳叔 , 邓丽萍 , 周保雪 , 李强 . 不同轧制工艺对纯锡微观组织与性能的影响 . | 稀有金属材料与工程 , 2023 , 52 (01) , 206-214 . |
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采用注浆成型法在不同烧结参数下制备ITO靶材,研究不同氧气流量及烧结保温时间对ITO靶材的相含量与电阻率的影响.通过X射线衍射(XRD)和扫描电镜(SEM)对ITO靶材的物相组成以及微观组织形貌进行表征,运用Rietveld法对样品XRD数据进行结构精修以计算其相含量.研究结果表明:靶材均由主相(In2 O3相)以及第二相(In4 Sn3 O12相)组成.当氧气流量由40 L/min提高到160 L/min时,第二相含量由19.82％(质量分数,下同)逐渐增加到25.83％;当保温时间由6 h延长到12 h时,第二相含量由19.79％逐渐增加到31.27％.对不同氧气流量以及烧结保温时间下所制备的样品进行相对密度以及电阻率测定,结果表明,靶材密度是影响其电阻率的最主要因素,靶材的电阻率随着密度的增加而降低.靶材密度相近时,靶材相含量对其电学性能有较大的影响,此时靶材的电阻率随着第二相含量的增加而增大.
Keyword ：
ITO靶材 ITO靶材 Rietveld法精修 Rietveld法精修 电阻率 电阻率 相含量 相含量
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| GB/T 7714 | 池铭浩 , 翁卫祥 , 李强 . 氧气流量及烧结保温时间对ITO靶材的相含量与电阻率的影响 [J]. | 材料导报 , 2022 , 36 (5) : 15-19 . |
| MLA | 池铭浩 et al. "氧气流量及烧结保温时间对ITO靶材的相含量与电阻率的影响" . | 材料导报 36 . 5 (2022) : 15-19 . |
| APA | 池铭浩 , 翁卫祥 , 李强 . 氧气流量及烧结保温时间对ITO靶材的相含量与电阻率的影响 . | 材料导报 , 2022 , 36 (5) , 15-19 . |
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本发明公开了一种具有均匀取向的高纯铝靶材的制备方法。本发明的制备方法包括预先热处理、多向热锻、中间退火、热轧、再结晶退火。将多向锻造和热轧的变形特点相结合，获得变形均匀且具有足够大储存能的铝板，最后再通过对再结晶退火加热速率及温度的控制，得到晶粒尺寸小于100μm的高纯铝靶材，同时使得高纯铝靶材(200)面取向含量在40%以上，取向在不同厚度上分布一致。较小的晶粒尺寸和均匀的取向分布保证了靶材具有高溅射效率的同时，溅射速率也较为稳定，有利于提高溅射薄膜的质量。
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| GB/T 7714 | 李强 , 林志程 . 一种具有均匀取向的高纯铝靶材的制备方法 : CN202111092164.8[P]. | 2021-09-17 . |
| MLA | 李强 et al. "一种具有均匀取向的高纯铝靶材的制备方法" : CN202111092164.8. | 2021-09-17 . |
| APA | 李强 , 林志程 . 一种具有均匀取向的高纯铝靶材的制备方法 : CN202111092164.8. | 2021-09-17 . |
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Thermal barrier coating is a high-temperature protective technology widely used in industrial gas turbines. However, the failure of coating peeling because of the generation of thermally grown oxide (TGO) at the interface during service hinders its further application. In this study, Raman spectroscopy and wedge indentation are used to determine the TGO residual stress and the interface energy release rate, respectively. The effect of TGO on the interfacial fracture toughness during the growth process was discussed. Raman spectroscopy test results show that the residual stress of TGO is about 0.5 GPa. Wedge indentation test results illustrate that high-temperature heat treatment could accelerate the interface degradation of thermal barrier coatings. Stress analysis and test research demonstrate that the microcracks induced by compressive stress of TGO will propagate with increasing heating time, ending with failure of barrier coatings.
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| GB/T 7714 | Wang, Yue M. , Weng, Wei X. , Chi, Ming H. et al. Investigation into the evolution of interface fracture toughness of thermal barrier coatings with thermal exposure treatment by wedge indentation [J]. | JOURNAL OF MATERIALS RESEARCH , 2020 , 35 (13) : 1715-1725 . |
| MLA | Wang, Yue M. et al. "Investigation into the evolution of interface fracture toughness of thermal barrier coatings with thermal exposure treatment by wedge indentation" . | JOURNAL OF MATERIALS RESEARCH 35 . 13 (2020) : 1715-1725 . |
| APA | Wang, Yue M. , Weng, Wei X. , Chi, Ming H. , Liu, Bai L. , Li, Qiang . Investigation into the evolution of interface fracture toughness of thermal barrier coatings with thermal exposure treatment by wedge indentation . | JOURNAL OF MATERIALS RESEARCH , 2020 , 35 (13) , 1715-1725 . |
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The effect of initial texture on the twinning behaviors of pure titanium during uniaxial compression was investigated by electron backscattered diffraction (EBSD) technology. The {11 - 22} and {10 - 12} twinning variant selection behaviors were investigated by the Schmid factor (SF), strain compatibility factor (m') and twinning strain tensor. For {11 - 22} contraction twins, multiple twin variants are more likely to form within a grain. For {10 - 12} extension twins, however, single variant is usually observed within one grain. The variant selection of {10 - 12} twinning is more favorable to follow the SF law than that of {11 - 22} twinning. However, both {11 - 22} twinning and {10 - 12} twinning variant selection behaviors can be well explained by the twinning strain tensor. The activated {11 - 22} twinning or {10 - 12} twinning variants can well accommodate the deformation along the compression direction. For intragranular cases, when multiple twins are generated within a grain, most of the activated variants have high SF values, and both {11 - 22} twinning and {10 - 12} twinning activities show stronger orientation dependence. For intergranular twin pairs, the strain compatibility is related to their formation sites. The twin pairs forming in the common boundaries of the two grains have good strain compatibility. However, twin pairs at those triple junctions show poor strain compatibility.
Keyword ：
Pure titanium Pure titanium Schmid factor Schmid factor Strain compatibility Strain compatibility Strain tensor Strain tensor Twinning Twinning Variant selection Variant selection
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| GB/T 7714 | Ye, Peng , Yao, Jinyi , Wang, Bingshu et al. A comparative study between {11-22} twinning and {10-12} twinning variant selection mechanisms during uniaxial compression in pure titanium [J]. | MATERIALS CHARACTERIZATION , 2020 , 162 . |
| MLA | Ye, Peng et al. "A comparative study between {11-22} twinning and {10-12} twinning variant selection mechanisms during uniaxial compression in pure titanium" . | MATERIALS CHARACTERIZATION 162 (2020) . |
| APA | Ye, Peng , Yao, Jinyi , Wang, Bingshu , Liu, Huimin , Deng, Liping , Wang, Chen et al. A comparative study between {11-22} twinning and {10-12} twinning variant selection mechanisms during uniaxial compression in pure titanium . | MATERIALS CHARACTERIZATION , 2020 , 162 . |
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目的优化Mg-Al LDH/MAO涂层的制备工艺,提高铝合金的耐蚀性。方法将微弧氧化样置于不同pH溶液中,在不同反应时间和反应温度下,采用原位生长法在2024铝合金表面制备层间含NO_3~–的MgAl-LDHs/MAO复合涂层。借用SEM、EDS、XRD研究LDH/MAO的微观组织结构,并利用电化学法表征MgAl-LDH/MAO复合涂层试样的腐蚀行为,揭示复合涂层的耐蚀机理以及最优异的工艺条件。结果 pH值为6和7的溶液制备出的涂层,生成了少量的LDHs,多数集中在孔洞附近,且生长不完全。相比之下,pH值为9的溶液制备出的涂层生成的片状水滑石更多,且较均匀,腐蚀电流较低,腐蚀电位较高。反应时间...
Keyword ：
微弧氧化 微弧氧化 水滑石 水滑石 腐蚀性能 腐蚀性能 铝合金 铝合金
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| GB/T 7714 | 任魏巍 , 梁思琰 , 符殿宝 et al. 铝合金PEO涂层表面原位制备Mg-Al LDH膜及其耐蚀性能研究 [J]. | 表面技术 , 2020 , 49 (04) : 254-262 . |
| MLA | 任魏巍 et al. "铝合金PEO涂层表面原位制备Mg-Al LDH膜及其耐蚀性能研究" . | 表面技术 49 . 04 (2020) : 254-262 . |
| APA | 任魏巍 , 梁思琰 , 符殿宝 , 李强 , 陈俊锋 . 铝合金PEO涂层表面原位制备Mg-Al LDH膜及其耐蚀性能研究 . | 表面技术 , 2020 , 49 (04) , 254-262 . |
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It is known that residual stress is the main factor causing the final failure of thermal barrier coatings (TBCs). However, it is still unclear how the stress governs the cracking sequence. In this paper, atmospheric plasma-sprayed (APS) 8 wt% yttria-stabilized zirconia (YSZ) TBCs were subjected to isothermal heat treatment at 1050 degrees C for different time. The cracking evolution and the underlying mechanical mechanisms for cracking were investigated. Residual stress distribution through the YSZ thickness was evaluated using Raman spectroscopy. It is found that, after thermal exposure, the in-plane residual compression in the top-coat (TC) near the TC/thermally grown oxide (TGO) interface increases as the TGO thickens, inducing tensile stresses normal to the interface in the TC close to the undulation crests. A spherical analytical model is used to evaluate this tensile stress, and the result shows that it rises with the TGO growth. This normal tensile stress is the driving force for cracking of TBCs. Cracking parallel to the TGO/TC interface first initiates in the TC near the interface, and then coalesces with the cracks within the TGO and at the bond-coat (BC)/TGO interface, leading to the final delamination. Because TC has a relatively low fracture toughness, the delamination trajectory is primarily in the TC near the TGO/TC interface and along the pathway that contains inter-splat cracks, pores and weak splat boundaries. The results indicate that the large in-plane compressions play a significant role in the cracking evolution of TBCs because they induce normal tensile stress in the TC or at the TGO/BC interface. A cracking pattern dominated by the stress evolution is established in this work and it will provide an informed basis for improving the durability of APS-TBCs.
Keyword ：
Cracking evolution Cracking evolution Interfacial undulation Interfacial undulation Microstructure Microstructure Residual stress Residual stress Thermal barrier coatings Thermal barrier coatings
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| GB/T 7714 | Weng, Wei-Xiang , Zheng, Zhen-Huan , Li, Qiang . Cracking evolution of atmospheric plasma-sprayed YSZ thermal barrier coatings subjected to isothermal heat treatment [J]. | SURFACE & COATINGS TECHNOLOGY , 2020 , 402 . |
| MLA | Weng, Wei-Xiang et al. "Cracking evolution of atmospheric plasma-sprayed YSZ thermal barrier coatings subjected to isothermal heat treatment" . | SURFACE & COATINGS TECHNOLOGY 402 (2020) . |
| APA | Weng, Wei-Xiang , Zheng, Zhen-Huan , Li, Qiang . Cracking evolution of atmospheric plasma-sprayed YSZ thermal barrier coatings subjected to isothermal heat treatment . | SURFACE & COATINGS TECHNOLOGY , 2020 , 402 . |
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Acoustic emission (AE) monitoring was used during indentation tests on the cross section of plasma-sprayed 8 wt.% yttria-stabilized zirconia (8YSZ) thermal barrier coatings to investigate the relationship between AE signals and the associated deformation or single cracking events. The damage evolution in 8YSZ was studied by examining signal characteristics with the aid of AE parameter analysis and wavelet packet decomposition. The results show that the coatings were firstly elasto-plastically deformed, and microcracks gradually developed around the indentation. Then, delamination occurred and the fracture was made up of some longer cracks and dozens of microcracks. AE signals originating from coating deformation, formation of microcracks and longer cracks show different amplitudes and frequencies. The results indicate that the features of AE parameters differ depending on the mechanical failure mechanism, and AE responses are closely related to the fracture behavior and are dependent on splat microstructure of the coatings.
Keyword ：
acoustic emission signal acoustic emission signal mechanical failure mechanism mechanical failure mechanism microstructure microstructure thermal barrier coatings thermal barrier coatings wavelet packet decomposition wavelet packet decomposition
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| GB/T 7714 | Weng, Wei-Xiang , Cao, Jian-liang , Lin, Hui-ling et al. Acoustic Emission and Associated Damage Mechanism Analysis in 8YSZ Thermal Barrier Coatings Under Instrumented Indentation [J]. | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2019 , 28 (7) : 1651-1663 . |
| MLA | Weng, Wei-Xiang et al. "Acoustic Emission and Associated Damage Mechanism Analysis in 8YSZ Thermal Barrier Coatings Under Instrumented Indentation" . | JOURNAL OF THERMAL SPRAY TECHNOLOGY 28 . 7 (2019) : 1651-1663 . |
| APA | Weng, Wei-Xiang , Cao, Jian-liang , Lin, Hui-ling , Li, Qiang . Acoustic Emission and Associated Damage Mechanism Analysis in 8YSZ Thermal Barrier Coatings Under Instrumented Indentation . | JOURNAL OF THERMAL SPRAY TECHNOLOGY , 2019 , 28 (7) , 1651-1663 . |
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Mg alloy has hexagonal structure and exhibits poor workability at room temperature, which is attributed to the difficulty in activating a sufficient number of independent slips to accommodate the deformation. Twinning plays an important role in plastic deformation of Mg alloys during low and medium temperature to accommodate the imposed strain, especially the strain along the c-axis. Therefore, the microstructure and texture evolutions of AZ31 Mg alloy during multi-pass compressions at room temperature were investigated by EBSD technology. The results show that the microstructure and texture evolutions are mainly controlled by tension twinning during multi-pass compression. And the more the strain passes, the severer the texture transformation. The c-axes of the grains are almost rotated to the compression direction by tension twins. The twins generated during multi-directional compression can separate grains and then refine them. However, the de-twinning can rotate the grains back to the initial orientations, which is against the texture weakening. The Schmid law governs the characteristics of {10 (1) over bar2} twinning, and thus controls the texture evolution. Both the residual matrix and the pre-deformation induced twins intersect with the twins generated during subsequent deformation. And this can separate the grains and weaken the texture strength. The number and morphology of the activated twin behavior during multi-pass compression would be influenced by the pass reductions, consequently affecting the grain refinement.
Keyword ：
grain refinement grain refinement Mg alloy Mg alloy multi-pass deformation multi-pass deformation texture texture twinning twinning
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| GB/T 7714 | Deng Liping , Cui Kaixuan , Wang Bingshu et al. Microstructure and Texture Evolution of AZ31 Mg Alloy Processed by Multi-Pass Compressing Under Room Temperature [J]. | ACTA METALLURGICA SINICA , 2019 , 55 (8) : 976-986 . |
| MLA | Deng Liping et al. "Microstructure and Texture Evolution of AZ31 Mg Alloy Processed by Multi-Pass Compressing Under Room Temperature" . | ACTA METALLURGICA SINICA 55 . 8 (2019) : 976-986 . |
| APA | Deng Liping , Cui Kaixuan , Wang Bingshu , Xiang Hongliang , Li Qiang . Microstructure and Texture Evolution of AZ31 Mg Alloy Processed by Multi-Pass Compressing Under Room Temperature . | ACTA METALLURGICA SINICA , 2019 , 55 (8) , 976-986 . |
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