Mg_(91.4)Zn_(7.2)Y_(1.4)合金中的相变及相平衡  

Phase transformation and relative phase equilibria in alloy Mg_(91.4)Zn_(7.2)Y_(1.4)

作　　者：刘博书[1] 李洪晓[1] 任玉平[1] 蒋敏[1] 秦高梧[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,沈阳110819

出　　处：《材料与冶金学报》2016年第2期128-131,共4页Journal of Materials and Metallurgy

基　　金：国家自然科学基金资助(51271053);(51371046);辽宁省自然科学基金项目(201202068)

摘　　要：采用热分析以及合金平衡组织结构分析,对Mg-Zn-Y系Mg_(91.4)Zn_(7.2)Y_(1.4)合金中的相变及其相关相平衡进行了研究.结果表明,Mg_(91.4)Zn_(7.2)Y_(1.4)合金在440℃时处于α-Mg固溶体和准晶I的两相平衡;450℃时处于α-Mg固溶体、液相Liq和三元化合物W的三相平衡.Mg_(91.4)Zn_(7.2)Y_(1.4)合金在446.8℃时发生了I+α-Mg→Liq+W四相包共晶转变.温度超过477.3℃,Mg_(91.4)Zn_(7.2)Y_(1.4)合金中W相不再稳态存在,500℃时合金处于α-Mg和液相两相平衡.Equilibrium microstructures, compositions and phase transformation in alloy Mg_（91.4）Zn_（7.2）Y_（1.4）were investigated through the equilibrated alloy method and D SC. It was shown that alloy Mg_（91.4）Zn_（7.2）Y_（1.4）is in the two-phase equilibrium consisting of α- Mg solid solution and quasicrystal phase I at 440 ℃. W hile at 450 ℃,alloy Mg_（91.4）Zn_（7.2）Y_（1.4）is in the three- phase equilibrium consisting of α- Mg solid solution,liquid phase and ternary compound W. A ternary peritectic reaction I ＋ α- Mg→Liq ＋ W occurs at 446. 8 ℃. Above 477. 3 ℃,W phase is dissolved in alloy Mg_（91.4）Zn_（7.2）Y_（1.4）. The two- phase equilibrium consisting of α- Mg solid solution and liquid phase exists in alloy Mg_（91.4）Zn_（7.2）Y_（1.4）at 500 ℃.

关 键 词：Mg-Zn-Y系 相变 相平衡 

分 类 号：TG146.22[一般工业技术—材料科学与工程]