To fabricate high performance parts, this paper aims to systematically study the pores characteristics and their formation mechanisms in selective laser melting (SLM) AlSi10Mg.,Cubes of 10 × 10 × 5 mm were manufactured in different laser power, scan speed and scan space. Optical microscope (OM) and scanning electron microscopes (SEM) were used to observe morphology of pores.,Round or irregular pores were found in SLMed AlSi10Mg parts. All the round pores have smooth inner walls and locate in the melt pool. The formation mechanisms of the round pores are contributed to the evaporation of elements in the melt pool, H2O, high laser energy input and hollow powder. Irregular pores have rough inner walls. Big scan space, unevenness of the upper surface, large layer thickness, spatter and oxide are the main reasons of generating irregular pores which outside the melt pool. Instability of keyhole leads to the irregular pores locate in the bottom of keyhole mode melt pool.,Relationship between pores and melt pool were studied systematically for the first time. Researches of pores characteristics and their formation mechanisms in SLMed AlSi10Mg would be a valuable reference for researchers to obtain an important insight into and control the defect in SLMed Al alloy.

中文翻译：

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SLMed AlSi10Mg的孔隙及形成机制

为了制造高性能零件，本文旨在系统地研究选择性激光熔化 (SLM) AlSi10Mg., 10 × 10 × 5 mm 立方体在不同激光功率、扫描速度和扫描空间下的孔隙特征及其形成机制。用光学显微镜(OM)和扫描电子显微镜(SEM)观察孔的形貌。在SLMed AlSi10Mg零件中发现圆形或不规则的孔。所有的圆孔都具有光滑的内壁并位于熔池中。圆孔的形成机制与熔池中元素的蒸发、H2O、高激光能量输入和空心粉末有关。不规则的毛孔有粗糙的内壁。扫描空间大，上表面不平整，层厚大，飞溅和氧化物是熔池外产生不规则气孔的主要原因。锁孔的不稳定性导致锁孔模式熔池底部出现不规则的孔隙。首次系统地研究了孔隙与熔池的关系。研究 SLMed AlSi10Mg 孔隙特征及其形成机制将为研究人员深入了解和控制 SLMed 铝合金中的缺陷提供有价值的参考。