Influence of element vaporization on formability, composition, microstructure, and mechanical performance of the selective laser melted Mg–Zn–Zr components
Influence of element vaporization on formability, composition, microstructure, and mechanical performance of the selective laser melted Mg–Zn–Zr components
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DOI：
10.1016/j.matlet.2015.05.074
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发表时间：
2015-10
影响因子：
3
通讯作者：
Wei Kaiwen;Zemin Wang;Xiaoyan Zeng
中科院分区：
文献类型：
--
作者：
Wei Kaiwen;Zemin Wang;Xiaoyan Zeng
采用选择性激光熔化技术制备Mg-5.2Zn-0.5Zr（ZK 60）合金构件，研究了元素蒸发对最终制品成形性、成分、组织和力学性能的影响。竣工构件的相对密度最高，为94.05%。结果表明，所有产物的Mg：Zn比均高于原料，Mg和Zn的总含量均低于原料，与Langmuir和Chapman-Enskog模型计算结果吻合较好。SLM处理后，成分的变化引起细化的显微组织，减少Mg-Zn沉淀物。尽管增强元素Zn的相对含量的降低会降低预制试样的力学性能，但细化的显微组织仍然确保了与锻造ZK 60的显微硬度相当的理想显微硬度。
Selective laser melting was used to fabricate Mg–5.2Zn–0.5Zr (ZK60) components and the influence of element vaporization on formability, composition, microstructure, and mechanical performance of the final products was studied. As-built components presented a highest relative density of 94.05%. All products exhibited a higher Mg:Zn ratio and a lower total content of Mg and Zn than the raw material, matching well with the result calculated from Langmuir and Chapman–Enskog models. After SLM processing, the variation in composition induced a refined microstructure with lessened Mg–Zn precipitates. Although the decrease in relative content of reinforcement element Zn could degrade mechanical performance of the as-built sample, the refined microstructure still ensured an ideal microhardness comparable to those of the wrought ZK60.