摘要
通过对粗镁、粗锌同时蒸发产生的高温金属蒸气流,经高温下的气态混合和300~350℃冷凝后得到较纯净的镁锌二元合金,并对不同时间段的冷凝产物进行显微组织和能谱分析,其结果表明：冷凝产物的组织不同于传统凝固态组织,冷凝初期形成了细长的柱状晶;且随着时间的延长,发生了元素间的扩散,柱状晶局部熔断,出现低熔点的固溶体,在随后的冷却过程中,形成了圆整度较好的α-Mg固溶体以及细小的Mg_7Zn_3化合物与α-Mg的共晶体组织。
The Mg-Zn alloy was produced by vacuum evaporation of crude Mg and Zn and via gas-phase mixture. The impact of the alloying conditions, including but not limited to the evaporation temperature, condensation time, impurity contents and pressure, On the microstructures and phase structure of the condensed Mg-Zn alloy were investigated with scanning electron microscopy and energy dispersive spectroscopy. Under the optimized conditions,hlghly pure Mg-Zn alloy was obtained. We found that the microstructures of the Mg-Zn alloy were markedly different from those of the convention-ally solidified Mg-Zn alloy. In the initial stage, fine columnar eutectic grains were observed; then, solid solution with low melting point and melted defects showed up, possibly because of inter-diffusion; and finally, spherical a-Mg solid solution was found to coexist with the eutectie structures of the MgTZn3 nano-rods and finer spheres of Mg-Zn alloy.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2015年第6期685-688,共4页
Chinese Journal of Vacuum Science and Technology
基金
陕西省科技统筹计划项目(No.KTCQ1-17)
陕西省教育厅项目(No.2013JK0861)
青海省国际科技合作项目(No.2014-HZ-819)
关键词
气相合金化
镁合金
蒸发冷凝
Vapor alloying, Mg alloy, Evaporation and condensation
