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学者姓名：朱定一
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Abstract ：
使用高精度测温仪、金相显微镜(OM)和扫描电镜(SEM)等手段,研究了冷却速率、过冷度和再辉温度对Al-20%Si合金Si相形貌和性能的影响。结果表明:Al-20%Si合金初生Si的平均尺寸(D)与冷却速率(v)呈幂函数关系D=260.6v-3/4,而与再辉温度(Tm)则呈线性关系D=0.25Tm-143.12;降低初生Si生长的再辉温度,是控制晶粒长大的关键;铜模的高蓄热系数能持续降低初生Si的形核温度和再辉温度,使初生Si细小;初生Si由小平面生长转变为非小平面生长的临界过冷度为70 K,与理论计算结果(74 K)基本一致;随着冷却速率的增大、过冷度的增加和再辉温度的降低,Al-20%Si...
Keyword ：
Al-20%Si合金 Al-20%Si合金 Si相形貌 Si相形貌 再辉温度 再辉温度 冷却速率 冷却速率 力学性能 力学性能 金属材料 金属材料
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| GB/T 7714 | 江峻 , 黄诗鑫 , 王连登 et al. 冷却速率对Al-20%Si合金Si相形貌及性能的影响 [J]. | 材料研究学报 , 2019 , 33 (04) : 291-298 . |
| MLA | 江峻 et al. "冷却速率对Al-20%Si合金Si相形貌及性能的影响" . | 材料研究学报 33 . 04 (2019) : 291-298 . |
| APA | 江峻 , 黄诗鑫 , 王连登 , 张思彬 , 朱定一 . 冷却速率对Al-20%Si合金Si相形貌及性能的影响 . | 材料研究学报 , 2019 , 33 (04) , 291-298 . |
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目的获得在反应润湿过程中固液界面能与时间变化的关系,掌握反应润湿动力学的核心问题。方法基于反应润湿过程中反应界面处的三相能量处于动态平衡状态,以反应界面新相覆盖率α和界面活性元素占位浓度分数Φs为变量,结合Young方程带入边界条件进行数学推导,并且进一步采用Dezellus推出的cosθ-t关系的动力学方程进行理论推导。通过真空熔炼炉炼制NiSi合金,采用改良座滴法,在高温真空润湿仪中的石墨基板上进行润湿实验,用高分辨率的CCD相机拍摄反应润湿过程中接触角的变化,获取接触角数据,结合公式计算,验证动力学方程。结果理论推导出了固液界面能与时间关系的动力学方程。该方程与文献中将固液界面能在反应过...
Keyword ：
NiSi合金 NiSi合金 Young方程 Young方程 动力学 动力学 反应界面 反应界面 固液界面能 固液界面能 接触角 接触角 润湿性 润湿性
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| GB/T 7714 | 林长顺 , 顾逸乔 , 王婷婷 et al. 固液界面反应润湿动力学的表征与计算 [J]. | 表面技术 , 2019 , 48 (08) : 177-184 . |
| MLA | 林长顺 et al. "固液界面反应润湿动力学的表征与计算" . | 表面技术 48 . 08 (2019) : 177-184 . |
| APA | 林长顺 , 顾逸乔 , 王婷婷 , 朱定一 , 王连登 . 固液界面反应润湿动力学的表征与计算 . | 表面技术 , 2019 , 48 (08) , 177-184 . |
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The work aims to obtain the relationship of solid-liquid interface energy changing over time during the reaction wetting process and master the core problem of reaction wetting kinetics. Theory derivation: during reaction wetting process, three-phase energy was in dynamic equilibrium at reaction interface. Based on this, new phase coverage rate at the reaction interface and the fraction of interface active element occupancy concentration were taken as two variables so that Young's equation and the boundary conditions could be used for mathematical derivation. Dezelluss cosθ-t relationship dynamic equation was also used for further theoretical derivation. Experimental verification: NiSi alloys were refined by vacuum melting furnace, and wetting experiments on graphite substrate were carried out in a high temperature vacuum humidifier by modified seat drop method. Change of contact angle during the reaction wetting process was recorded by a high resolution CCD camera to get contact angle data. The kinetic equation was verified by the data and formula. Through theoretical derivation, kinetic equation of the relationship between solid-liquid interface energy and time was derived. This equation was the same as the equation with instantaneous difference of solid-liquid interface energy as driving force during reaction process, and also identical to the equation derived by the Dezelluss cosθ-t relationship. In the kinetic equation, the solid-liquid interface energy was exponentially reduced over time. Results of wetting experiment by Ni-Si/C system showed that solid-liquid interface energy decreased exponentially with reaction time during the interface reaction control stage, which was consistent with solid-liquid interface energy changing with reaction time in the theoretically derived kinetic equation. Moreover, the activation energy of interfacial reaction of Ni-45wt%Si/C system was calculated to be 239 kJ/mol in combination with the kinetic equation and Arrhenius equation, which was close to the value reported in literature. The reaction kinetics equation is reliable in reactive wetting process. The relationship between solid-liquid interface energy and time is exponentially reduced, which can provide a theoretical reference for surface modification and wettability in coatings. © 2019, Chongqing Wujiu Periodicals Press. All rights reserved.
Keyword ：
Activation energy Activation energy CCD cameras CCD cameras Contact angle Contact angle Dynamics Dynamics Integral equations Integral equations Kinetic energy Kinetic energy Kinetics Kinetics Kinetic theory Kinetic theory Liquids Liquids Melting furnaces Melting furnaces Metal melting Metal melting Phase interfaces Phase interfaces Reaction kinetics Reaction kinetics Silicon Silicon Silicon alloys Silicon alloys Vacuum furnaces Vacuum furnaces Wetting Wetting
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| GB/T 7714 | Lin, Chang-Shun , Gu, Yi-Qiao , Wang, Ting-Ting et al. Characterization and calculation of dynamics of reactive wetting at solid-liquid interface [J]. | Surface Technology , 2019 , 48 (8) : 177-184 . |
| MLA | Lin, Chang-Shun et al. "Characterization and calculation of dynamics of reactive wetting at solid-liquid interface" . | Surface Technology 48 . 8 (2019) : 177-184 . |
| APA | Lin, Chang-Shun , Gu, Yi-Qiao , Wang, Ting-Ting , Zhu, Ding-Yi , Wang, Lian-Deng . Characterization and calculation of dynamics of reactive wetting at solid-liquid interface . | Surface Technology , 2019 , 48 (8) , 177-184 . |
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采用P和RE对Al-20Si合金进行复合变质,并用铜模冷却不同壁厚铸件进行试验,采用OM、SEM分析复合变质对Si相组织的影响,并对其磨损性能进行研究.结果 表明,铜模的高蓄热系数与铸件壁厚的减小降低了合金的再辉温度,与复合变质共同作用,起到明显细化Si相作用,5 mm厚铸件中初生Si平均晶粒尺寸仅为7.1 μm.随着晶粒尺寸减小,硬度逐渐增大,磨损量变小.当铸件厚度逐渐减小时,合金由剥层磨损机制转变为磨粒磨损和粘着磨损的混合机制.
Keyword ：
Al-20Si合金 Al-20Si合金 再辉温度 再辉温度 复合变质 复合变质 磨损性能 磨损性能
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| GB/T 7714 | 袁中人 , 王连登 , 张拓 et al. 复合变质对不同壁厚Al-20Si合金组织及磨损性能的影响 [J]. | 特种铸造及有色合金 , 2019 , 39 (8) : 909-913 . |
| MLA | 袁中人 et al. "复合变质对不同壁厚Al-20Si合金组织及磨损性能的影响" . | 特种铸造及有色合金 39 . 8 (2019) : 909-913 . |
| APA | 袁中人 , 王连登 , 张拓 , 朱定一 , 陈明 , 林佳伟 . 复合变质对不同壁厚Al-20Si合金组织及磨损性能的影响 . | 特种铸造及有色合金 , 2019 , 39 (8) , 909-913 . |
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Abstract ：
使用高精度测温仪、金相显微镜(OM)和扫描电镜(SEM)等手段,研究了冷却速率、过冷度和再辉温度对Al-20％Si 合金Si 相形貌和性能的影响.结果表明:Al-20％Si 合金初生Si 的平均尺寸(D)与冷却速率(v)呈幂函数关系D=260.6v-3/4,而与再辉温度(Tm)则呈线性关系D=0.25Tm-143.12;降低初生Si 生长的再辉温度,是控制晶粒长大的关键;铜模的高蓄热系数能持续降低初生Si 的形核温度和再辉温度,使初生Si 细小;初生Si 由小平面生长转变为非小平面生长的临界过冷度为70 K,与理论计算结果(74 K)基本一致;随着冷却速率的增大、过冷度的增加和再辉温度的降低,Al-20％Si 合金的凝固组织显著细化,合金的抗拉强度由167 MPa 提高到210 MPa,延伸率则由2.14％提高到3.89％.
Keyword ：
Al-20％Si合金 Al-20％Si合金 Si相形貌 Si相形貌 再辉温度 再辉温度 冷却速率 冷却速率 力学性能 力学性能 金属材料 金属材料
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| GB/T 7714 | 江峻 , 黄诗鑫 , 王连登 et al. 冷却速率对Al-20％Si合金Si相形貌及性能的影响 [J]. | 材料研究学报 , 2019 , 33 (4) : 291-298 . |
| MLA | 江峻 et al. "冷却速率对Al-20％Si合金Si相形貌及性能的影响" . | 材料研究学报 33 . 4 (2019) : 291-298 . |
| APA | 江峻 , 黄诗鑫 , 王连登 , 张思彬 , 朱定一 . 冷却速率对Al-20％Si合金Si相形貌及性能的影响 . | 材料研究学报 , 2019 , 33 (4) , 291-298 . |
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使用差示扫描量热仪(DSC)、扫描电镜(SEM)和X射线衍射仪(XRD)等手段研究了过饱和Al-20%Si合金压铸板在450～550℃热处理过程中组织结构的演变规律和Si相的析出和粗化动力学。结果表明:在高压快速凝固和细化、变质的多重作用下,Al-20%Si合金生成了Si相尺寸细小(Si相平均尺寸<1μm)的非平衡凝固畸变组织;在退火过程中,α-Al基体的晶格畸变程度有所缓解;Si相的粗化扩散机制接近体扩散控制(粗化指数n接近3),粗化激活能为69.59 kJ/mol;退火温度对粗化速率常数有显著的影响,对粗化指数的影响不明显;在退火初期,随着保温时间的延长合金的抗拉强度呈下降趋势而伸长率呈上...
Keyword ：
Al-20%Si合金 Al-20%Si合金 动力学 动力学 过饱和 过饱和 退火 退火 金属材料 金属材料
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| GB/T 7714 | 胡钟鹏 , 江峻 , 廖福锦 et al. 过饱和Al-20%Si合金Si相的析出粗化动力学 [J]. | 材料研究学报 , 2018 , 32 (10) : 743-750 . |
| MLA | 胡钟鹏 et al. "过饱和Al-20%Si合金Si相的析出粗化动力学" . | 材料研究学报 32 . 10 (2018) : 743-750 . |
| APA | 胡钟鹏 , 江峻 , 廖福锦 , 王连登 , 朱定一 . 过饱和Al-20%Si合金Si相的析出粗化动力学 . | 材料研究学报 , 2018 , 32 (10) , 743-750 . |
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Different surface areas of alpha-Fe2O3 nanocrystals have been achieved by annealing at different temperatures. Obtained samples were characterized by X-ray diffraction, Brunauer-Emmett-Teller technique, and transmission electron microscopy. The surface areas of alpha-Fe2O3 nanocrystals changed from 136.5 m(2)/g to 2.1 m(2)/g with the increase of annealing temperature from 280 degrees C to 700 degrees C. alpha-Fe2O3 nanocrystal catalytic activity on the decomposition of ammonium perchlorate (AP) was characterized through thermogravimetric analysis. The decomposition rate of AP with the addition of alpha-Fe2O3 nanocrystals was surface area relative. The 136.5 m(2)/g alpha-Fe2O3 nanocrystal exhibited the best catalytic activity, which lowered the high-temperature peak temperature of AP by 60.8 degrees C.
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| GB/T 7714 | Chen, L. J. , Shen, P. H. , Zhu, D. Y. . Tunable catalytic activities of different alpha-Fe2O3 surface areas in ammonium perchlorate thermal decomposition [C] . 2018 . |
| MLA | Chen, L. J. et al. "Tunable catalytic activities of different alpha-Fe2O3 surface areas in ammonium perchlorate thermal decomposition" . (2018) . |
| APA | Chen, L. J. , Shen, P. H. , Zhu, D. Y. . Tunable catalytic activities of different alpha-Fe2O3 surface areas in ammonium perchlorate thermal decomposition . (2018) . |
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The influence of age hardening treatment on the hardness and microstructure of semi-solid squeeze cast A319 alloy is investigated. At 175 degrees C, the age-hardening curve of the alloy shows two peaks between which there was an apparent valley. Analyses by transmission electron microscopy, selected area electron diffraction and energy-dispersive X-ray detection suggest that the first peak is caused by formation of G.P.2 zones while the second peak can be related to formation of the metastable theta '- and Q '-phases. Compared with gravity die cast A319 the semi-solid squeeze cast A319 shows a larger increase and a higher peak in hardness during the age hardening process. Additionally, the latter requires another 32 h to reach the first hardness peak while it reaches the second hardness peak about 24 h earlier than the former.
Keyword ：
A319 alloy A319 alloy age hardening age hardening gravity die casting gravity die casting semi-solid semi-solid squeeze casting squeeze casting
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| GB/T 7714 | Wang, Q. F. , Wang, L. D. , Zhu, D. Y. et al. Age hardening behaviour of semi-solid squeeze cast A319 aluminium alloy [J]. | MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK , 2018 , 49 (12) : 1503-1509 . |
| MLA | Wang, Q. F. et al. "Age hardening behaviour of semi-solid squeeze cast A319 aluminium alloy" . | MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK 49 . 12 (2018) : 1503-1509 . |
| APA | Wang, Q. F. , Wang, L. D. , Zhu, D. Y. , Lin, Z. , Chen, X. , Sheng, B. . Age hardening behaviour of semi-solid squeeze cast A319 aluminium alloy . | MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK , 2018 , 49 (12) , 1503-1509 . |
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使用差示扫描量热仪(DSC)、扫描电镜(SEM)和X射线衍射仪(XRD)等手段研究了过饱和Al-20％Si合金压铸板在450～550℃热处理过程中组织结构的演变规律和Si相的析出和粗化动力学.结果表明:在高压快速凝固和细化、变质的多重作用下,Al-20％Si合金生成了Si相尺寸细小(Si相平均尺寸＜1μm)的非平衡凝固畸变组织;在退火过程中,α-A1基体的晶格畸变程度有所缓解;Si相的粗化扩散机制接近体扩散控制(粗化指数n接近3),粗化激活能为69.59kJ/mol;退火温度对粗化速率常数有显著的影响,对粗化指数的影响不明显;在退火初期,随着保温时间的延长合金的抗拉强度呈下降趋势而伸长率呈上升趋势,保温时间超过90 min后抗拉强度和伸长率趋于稳定.
Keyword ：
Al-20％Si合金 Al-20％Si合金 动力学 动力学 过饱和 过饱和 退火 退火 金属材料 金属材料
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| GB/T 7714 | 胡钟鹏 , 江峻 , 廖福锦 et al. 过饱和Al-20％Si合金Si相的析出粗化动力学 [J]. | 材料研究学报 , 2018 , 32 (10) : 743-750 . |
| MLA | 胡钟鹏 et al. "过饱和Al-20％Si合金Si相的析出粗化动力学" . | 材料研究学报 32 . 10 (2018) : 743-750 . |
| APA | 胡钟鹏 , 江峻 , 廖福锦 , 王连登 , 朱定一 . 过饱和Al-20％Si合金Si相的析出粗化动力学 . | 材料研究学报 , 2018 , 32 (10) , 743-750 . |
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本发明公开了一种适合挤压铸造的高强韧高硅铝合金及其制备工艺，其组分按重量百分比计为 : 17‑23%Si, 0.5‑1%Cu, 0.3‑0.8%Mg, 0.2‑0.5%Fe, 0.5‑0.8%Mn, 0.2‑0.6%RE, 0.05‑0.1%P, 0.3%为其他微量元素，如Cr、Ti，余量为Al。本发明中高硅铝合金具有优异的金相组织结构，可适合于制造需要承受重载荷，高强度的铝合金结构零部件，且高硅铝合金产品具有优良的机械性能，免除了热处理工序，节约能耗，生产效率高，节省了生产成本。
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| GB/T 7714 | 朱定一 , 江峻 , 王连登 . 一种适合挤压铸造的高强韧高硅铝合金及其制备工艺 : CN201810075148.X[P]. | 2018/1/26 . |
| MLA | 朱定一 et al. "一种适合挤压铸造的高强韧高硅铝合金及其制备工艺" : CN201810075148.X. | 2018/1/26 . |
| APA | 朱定一 , 江峻 , 王连登 . 一种适合挤压铸造的高强韧高硅铝合金及其制备工艺 : CN201810075148.X. | 2018/1/26 . |
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