摘要
为探究固溶处理对流变压铸ZA94镁合金二次凝固组织的影响,利用光学显微镜、X射线衍射仪和显微硬度计研究自孕育流变压铸ZA94镁合金在不同固溶温度和时间下二次凝固相的显微组织和硬度变化。结果表明:自孕育流变压铸ZA94镁合金主要由球状的初生α-Mg相、等轴晶状的二次α-Mg相以及网状结构的Mg32(Al,Zn)49+Mg Zn组成;随着固溶时间的延长和固溶温度的升高,二次凝固的α-Mg相不断发生球化且尺寸增大,第二相由连续的网状结构演变为弥散沿晶界分布的颗粒状,硬度值呈先增大后减小的变化趋势,最佳的固溶工艺为340℃+(20~24)h,其硬度值为64.7HV^65.5HV。
In order to explore the effect of solution treatment on secondary solidification microstructure of the rheo-diecasting ZA94 magnesium alloy,the microstructure and hardness of ZA94 magnesium alloy prepared by self-inoculation rheo-diecasting with different solution time and temperature were investigated by using optical microscope（OM）,X-ray diffractometer（XRD）and microhardness tester. Results show that ZA94 magnesium alloy prepared by self-inoculation rheo-diecasting mainly contains primary α-Mg,equiaxed secondary solidification α-Mg and reticular Mg32（Al,Zn）49＋Mg Zn. With prolonging solution time and increasing solution temperature,secondary solidification α-Mg phases will spheroidize and grow. The distribution of second phases changes from quasti-continuous net to particles which is along the grain boundary. The hardness increases firstly,and then decreases. The best solution process is 340 ℃＋（20~24）h,and the hardness is 64.7 HV^65.5 HV.
作者
李春
李原
范新会
刘彦峰
南宁
杨超普
李元东
LI Chun;LI Yuan;FAN Xinhui;LIU Yanfeng;NAN Ning;YANG Chaopu;LI Yuandong(Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources,Shangluo University,Shangluo 726000,China;School of Materials and Chemical Engineering,Xi＇an Technological University,Xi＇an 710021,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2018年第4期13-18,共6页
Ordnance Material Science and Engineering
基金
国家自然科学基金(51464031)
国家级大学生创新创业训练计划项目(201511396705)
陕西省教育厅专项科研计划资助项目(16JK1241)
商洛市科技计划项目(SK2016-29)
关键词
固溶处理
ZA94镁合金
二次凝固
流变压铸
solution treatment
ZA94 magnesium alloy
secondary solidification
rheo-diecasting
