Mg-5.0Zn-xCa合金的微观组织与力学性能研究  

Microstructure and Mechanical Properties of Mg-5.0Zn-xCa Alloys

作　　者：张立生 王小巩 ZHANG Lisheng;WANG Xiaogong(Qinggong College,North China University of Science and Technology,Tangshan 064000,China;Key Laboratory of Modern Metallurgical Technology of the Ministry of Education,North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]华北理工大学轻工学院,河北唐山064000 [2]华北理工大学教育部现代冶金技术重点实验室,河北唐山063210

出　　处：《热加工工艺》2025年第5期86-89,共4页Hot Working Technology

基　　金：河北省自然科学基金项目(E2020209127,E2021209041)。

摘　　要：通过金属型铸造制备了Mg-5.0Zn-xCa(x=0、0.25、0.50)合金,并进行了均匀化处理和热挤压变形。采用OM、SEM、EDS、拉伸试验等手段,研究了Ca对Mg-5.0Zn-xCa合金微观组织与力学性能的影响。结果表明:随着Ca含量的增加,铸态Mg-5.0Zn-xCa合金中的MgZn相逐渐减少,Ca_(2)Mg_(6)Zn_(3)相含量和尺寸逐渐增加,晶粒尺寸逐渐增大。铸态Mg-5.0Zn-0.50Ca合金中Ca2Mg6Zn3相呈断续网状结构。Ca元素的加入,可以明显细化挤压态Mg-5.0Zn-xCa合金的晶粒。随着Ca含量的增加,挤压态Mg-5.0Zn-xCa合金的晶粒尺寸逐渐减小,强度逐渐升高,伸长先升高后降低。挤压态Mg-5.0Zn-0.50Ca合金的强度最大,Mg-5.0Zn-0.25Ca合金的塑性最佳,伸长率达到25.4%。Mg-5.0Zn-xCa(x=0,0.25,0.50)alloys were prepared by metal mold casting.And homogenizing treatment and hot extrusion of the alloys were carried out.The effects of Ca on the microstructure and mechanical properties of Mg-5.0Zn-xCa alloy were investigated by OM,SEM,EDS and tensile tests.The results show that with the increase of Ca content,the MgZn phase in the as-cast Mg-5.0Zn-xCa alloy decreases gradually,the number and size of Ca_(2)Mg_(6)Zn_(3)phases increase gradually,the grain size increases.The Ca2Mg6Zn3 phase in as-cast Mg-5.0Zn-0.5Ca alloy presents a discontinuous network structure.The grain of extruded Mg-5.0Zn-xCa alloy can be refined obviously by adding Ca element.With the increase of Ca content,the grain size of extruded Mg-5.0Zn-xCa alloy decreases gradually,the strength increases gradually,and the elongation increases first and then decreases.Mg-5.0Zn-0.50Ca alloy has the best strength,and the Mg-5.0Zn-0.25Ca alloy has the best plasticity,and the elongation is 25.4%.

关 键 词：Mg-Zn-Ca合金 Ca元素 组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]