Microstructures and mechanical properties of Si and Zr modified Al–Zn–Mg–Cu alloy-A comparison between selective laser melting and spark plasma sintering-猫眼课题宝

Si、Zr改性Al-Zn-Mg-Cu合金的显微组织和力学性能——选区激光熔化与放电等离子烧结的比较

DOI：

10.1016/j.jallcom.2019.153520

发表时间：

2020-04

期刊：

Journal of Alloys and Compounds

影响因子：

6.2

通讯作者：

中科院分区：

材料科学2区

文献类型：

作者：

Lanbo Li;Ruidi Li;Tiechui Yuan;Chao Chen;Mingbo Wang;Jiwei Yuan;Qigang Weng

采用选择性激光熔化（SLM）和放电等离子烧结（SPS）工艺对Si和Zr改性的Al-Zn-Mg-Cu合金粉末进行了烧结，并对烧结后的合金粉末的显微组织和力学性能进行了对比研究。采用扫描电子显微镜和电子色散谱仪对复合材料的微观结构进行了表征。用X射线衍射和电子背散射衍射对晶粒进行了表征。通过拉伸试验和维克斯硬度测量来表征机械性能。结果表明，SPS和SLM处理后的试样平均晶粒尺寸基本相同，SLM处理后的试样晶粒尺寸分布呈现双峰分布，而SPS处理后的试样晶粒尺寸分布均匀。Si元素在SPS样品中以团簇形式随机分布，而在SLM样品中则均匀分布。SLM印刷样品的强度和硬度远高于SPS处理的样品。

Si and Zr modified Al–Zn–Mg–Cu alloy powders were consolidated by selective laser melting (SLM) and spark plasma sintering (SPS) routes and their microstructures as well as mechanical properties were comparatively studied. The scanning electron microscopy equipped with electron-dispersive spectroscopy was applied to characterize microstructures. Grains were characterized with X-ray diffraction and electron backscatter diffraction. Mechanical properties were characterized by tensile tests and Vickers hardness measurements. The results show that average grain sizes of the SPS and SLM processed samples are basically the same while SLM sample possesses a bimodal grain size distribution, which is different from the SPS sample with uniform grain size. Si element is randomly distributed in SPS sample in the cluster form while the Si element are uniformly distributed in SLM sample. The strength and hardness of the SLM printed sample are much higher than the SPS processed sample.