The　applicability　of　constrained　groove　pressing　for　grain　refinement　and　improvements　in　mechanical　properties　of　two-phase　Cu-Zn　alloys　is　demonstrated.　It　is　shown　that　the　grain　size　and　volume　fraction　of　the　beta＇　phase　in　the　Cu-Zn　alloy　should　be　kept　small　through　proper　heat　treatment,　and　a　die　design　with　a　wider　groove　can　reduce　stresses　at　the　most　severely　loaded　region　of　the　workpiece,　all　of　which　allow　higher　numbers　of　pressings　to　attain　better　grain　refinement　and　improved　properties.　(C)　2007　Acta　Materialia　Inc.　Published　by　Elsevier　Ltd.　All　rights　reserved.