摘要
通过常规铸造与快速凝固法成功制得2类Mg-4Al-2Zn-xY(AZ42,x=0.5, 1.0,质量分数,%)镁合金,并系统研究了快速凝固对微量Y添加后AZ42合金组织和性能的影响。结果表明,快速凝固工艺与传统铸造相比可显著细化AZ42合金的微观组织并提高合金的力学性能和耐腐蚀特性。AZ42合金加入Y元素后组织主要由α-Mg基体、β-Mg17Al12相和Al_2Y相构成。此外,微量Y添加可显著细化AZ42合金的组织并改善网状β相分布,从而提高合金的力学与耐腐蚀性能;其中,当Y添加量为0.5%时可获得最佳综合性能。
Two kinds of Mg-4 Al-2 Zn-xY alloy(AZ42) with minor addition of Y element(x=0.5, 1.0 wt%) were fabricated by gravity casting and rapid solidification process. The microstructure, mechanical properties and corrosion behavior of AZ42 alloys with Y addition were investigated. The results show that the rapid solidification technique can significantly refine the microstructure of AZ42 alloys containing Y and improve related mechanical properties and corrosion resistance compared with the traditional casting. The microstructure of Y-bearing AZ42 alloy is mainly composed of a-Mg matrix,β-Mg17 Al12 phase and Al2 Y phase. Moreover, the addition of Y in AZ42 alloy results in grain refinement and enhancement of both mechanical and corrosion resistant properties, which may be attributed to fine grain size and distribution modification of β-phase. And the optimum amount of Y element in AZ42 alloy is determined to be 0.5 wt%.
作者
李其智
余晖
王志峰
王岳宸
孟帅举
肖海涛
赵维民
Li Qizhi;Yu Hui;Wang Zhifeng;Wang Yuechen;Meng Shuaiju;Xiao Haitao;Zhao Weimin(Hebei University of Technology,Tianjin 300130,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第3期1001-1007,共7页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51701060)
河北省自然科学基金优秀青年科学基金(E2016202130)
河北省教育厅高等学校科学研究计划项目(QN2015035)
河北工业大学优秀青年科技创新基金(2015002)
国家外专局高端外国专家项目(GDW20171300102)
关键词
镁合金
快速凝固
微观组织
力学性能
腐蚀行为
Magnesium alloy
rapid solidification
microstructure
mechanical properties
corrosion behavior
