李亚楠,聂凯波,邓坤坤,杨安.低合金化Mg-Zn-Y合金的显微组织与力学性能研究[J].稀有金属材料与工程,2021,50(4):1425~1432.[Li ya nan,NIE KAIBO,Deng kunkun,Yang an.Microstructures and mechanical properties of low-alloyed Mg-Zn-Y magnesium alloy[J].Rare Metal Materials and Engineering,2021,50(4):1425~1432.]
低合金化Mg-Zn-Y合金的显微组织与力学性能研究
投稿时间:2020-06-09  修订日期:2020-07-08
中文关键词:  Mg-Zn-Y合金  低合金化  低温挤压  微观组织  力学性能
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      本文通过常规铸造制备了三种成分的低合金化Mg-Zn-Y (Mg-0.6Zn-0.1Y、Mg-1.3Zn-0.1Y、Mg-2.0Zn-0.1Y,wt.%),并对其进行低温慢速挤压(140℃,0.1mm/s)。研究结果表明:随Zn含量的增加,挤压前合金的晶粒尺寸逐渐减少。挤压后合金晶粒显著细化,形成弥散的纳米析出相,同时随Zn含量的增加合金的再结晶程度与纳米析出相的数量均增加,基面织构强度则无显著变化。挤压后合金的力学性能得到大幅提升,其中Mg-2.0Zn-0.1Y合金的屈服强度、抗拉强度和延伸率分别达到406.4MPa、424.5MPa、12.2%。随Zn含量增加,Mg-Zn-Y合金的延伸率显著增加,其断口形貌由解理面转变为细小的韧窝,断裂方式由解理断裂转变为韧性断裂。
Microstructures and mechanical properties of low-alloyed Mg-Zn-Y magnesium alloy
英文关键词:Mg-Zn-Y alloy  low alloying  low-temperature extrusion  microstructures  mechanical properties
英文摘要:
      In this paper, three kinds of low alloyed Mg-Zn-Y (Mg-0.6Zn-0.1Y, Mg-1.3Zn-0.1Y, Mg-2.0Zn-0.1Y, wt.%) were prepared by conventional casting and then subjected to slow extrusion at low temperature (140°C, 0.1 mm/s). The results showed that with the increase of Zn content, the grain size of the alloy before extrusion gradually decreased. After extrusion, the grains were significantly refined and dispersed nano-precipitated phases were form. At the same time, as the increasing the Zn content, the recrystallization degree of the alloy and the number of nano-precipitation increased, while the basal texture intensity exhibited unobvious change. The mechanical properties of the as-extruded alloys have been dramatically improved. The YS,UTS and ELof Mg-2.0Zn-0.1Y alloy were 406.4MPa, 424.5MPa and 12.2%, respectively. With the increase of Zn content, the elongation of Mg-Zn-Y alloy increased significantly, the fracture morphology changed from cleavage surface to tiny dimples, and the fracture pattern varied from cleavage fracture to ductile fracture.
作者单位E-mail
李亚楠 太原理工大学 2930031476@qq.com 
聂凯波 太原理工大学 niekaibo2015@163.com 
邓坤坤 太原理工大学  
杨安 太原理工大学  
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