论文类型：期刊论文
第一作者：Kaiwen Wei
通讯作者：Xiaoyan Zeng
合写作者：Zemin Wang,Jinfeng Deng,Mengna Liu,Gao Huang,Xiaochi Yuan
发表刊物：Materials Science & Engineering A
收录刊物：SCI、EI
卷号：756
页面范围：226-236
发表时间：2019-05-22
影响因子：4.652
摘要：Mg-Zn binary alloys with seven distinctive compositions (Zn (wt.%) = 1, 2, 4, 6, 8, 10 and 12) were prepared using a selective laser melting (SLM) additive manufacturing technology. Densification behaviors and microstructure of the SLM-processed alloys were analyzed using quantitative metallography analysis, XRD, SEM, and EDS. The mechanical property characterizations were carried out through microhardness and uniaxial tensile tests. The results showed that the increase of Zn content had a significantly deteriorating effect on the densification response of the SLM-processed Mg-Zn alloys. At 1 wt% Zn content, near full-dense products could be obtained. At 2-10 wt% Zn contents, SLM-processed alloys suffered from solidification cracking and the crack density showed an approximate "A-shaped" variation trend with the increase of Zn content. At 12 wt% Zn content, solidification cracks were eliminated but lots of micro-pores formed within the SLM sample. All the SLM samples exhibited a duplex microstructure composed of alpha-Mg matrix and Mg7Zn3 eutectic phase. With the increase of Zn content, the quantity of Mg7Zn3 increased continuously whilst its morphology gradually transformed from granular shape to nearly reticular structure. The hardness and tensile tests showed that only the Mg-1Zn sample has comparable mechanical properties with the as-cast counterpart. At higher Zn contents, mechanical properties of the SLM-processed alloys became significantly degraded, mainly because of the deterioration of the densification degree.