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基于微尺度数字图像相关法的预腐蚀对增材制造AlSi10Mg损伤失效影响
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作者 江圣 杜娟 宋海鹏 《航空材料学报》 CAS CSCD 北大核心 2024年第3期95-101,共7页
通过光学显微镜下的原位拉伸实验和微尺度数字图像相关方法(μ-DIC)观测预腐蚀增材制造AlSi10Mg的损伤演化和失效过程,并结合微观变形场演化、材料微观结构、三维腐蚀形貌和断口微观形貌等丰富的实验信息分析材料的微裂纹萌生和扩展行... 通过光学显微镜下的原位拉伸实验和微尺度数字图像相关方法(μ-DIC)观测预腐蚀增材制造AlSi10Mg的损伤演化和失效过程,并结合微观变形场演化、材料微观结构、三维腐蚀形貌和断口微观形貌等丰富的实验信息分析材料的微裂纹萌生和扩展行为。结果表明:腐蚀坑周围和亚表面缺陷(由增材制造工艺引起)的应力集中导致微裂纹萌生;存在多个微裂纹同时萌生现象,源于关键损伤区域的裂纹扩展和合并主导了试件的最终破坏;材料微观结构和腐蚀形态对微裂纹扩展也存在重要影响。 展开更多
关键词 增材制造铝合金 局部腐蚀 原位拉伸测试 数字图像相关法 损伤演化
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Role of inclination angle on columnar-to-equiaxed transition in the eutectic Al-5Mg-2Si alloy fabricated by laser powder bed fusion 被引量:1
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作者 YANG Fei-peng WEN Tao +4 位作者 ZHANG Lei WANG Jian-ying HUANG Shi-long JI Shou-xun YANG Hai-lin 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第7期2150-2166,共17页
In this study,the effect of inclination angles relative to the building direction in the additively manufactured eutectic Al-5Mg-2Si alloy was investigated through the laser powder bed fusion(LPBF).The microstructures... In this study,the effect of inclination angles relative to the building direction in the additively manufactured eutectic Al-5Mg-2Si alloy was investigated through the laser powder bed fusion(LPBF).The microstructures and mechanical properties of the Al-5Mg-2Si alloy manufactured with different inclination angles(0°,30°,45°,60°and 90°)were reported and discussed.It is found that the“semicircular”melt pool(MP)in the load bearing face of 0°sample was eventually transformed into“stripe-like”MP in the 90°sample,accompanied by an increased fraction of melt pool boundaries(MPBs).Moreover,the microstructural analysis revealed that the columnar-to-equiaxed transition(CET)of theα-Al grains and eutectic Mg2Si was completed in the 90°sample,which were significantly refined with the average size of 10.6μm and 0.44μm,respectively.It is also found that the 90°sample exhibited good combination of strength and elongation(i.e.yield strength of 393 MPa,ultimate tensile strength of 483 MPa and elongation of 8.1%).The anisotropic mechanical properties were highly associated with the refined microstructures,thermal stress,and density of MPBs.Additionally,the CET driven by inclination angles was attributed to the variation of thermal conditions inside the local MPs. 展开更多
关键词 additive manufacturing aluminium alloys columnar-to-equiaxed transition ANISOTROPY mechanical property
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