This paper investigates long fatigue life characteristics of AlSi10Mg and AlSi7Mg aluminium alloys produced using direct metal laser sintering. An in‐house built ultrasonic fatigue testing machine was used to carry out fatigue tests on specimens machined from heat‐treated AlSi10Mg and AlSi7Mg alloys subjected to constant fully reversed tension–compression loadings. The fatigue life data acquired for these two additive manufacturing (AM) aluminium alloys were compared with previously published data under heat treatment and non‐heat treatment conditions. It was found that fatigue data of tested specimens fit more closely the data of specimens without any heat treatment. Fatigue test results indicate that effects of heat treatment on high cycle fatigue (HCF) and very high cycle fatigue (VHCF) performance of AM alloys should be further investigated in the context of the microstructural changes.

中文翻译：

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基于超声疲劳测试的增材制造的AlSi10Mg和AlSi7Mg铝合金的极高循环疲劳特性

本文研究了直接金属激光烧结生产的AlSi10Mg和AlSi7Mg铝合金的长疲劳寿命特性。使用一台内置的超声波疲劳试验机对由热处理过的AlSi10Mg和AlSi7Mg合金加工而成的样品进行恒定的完全反向拉伸-压缩载荷的疲劳测试。将这两种增材制造（AM）铝合金获得的疲劳寿命数据与先前发布的在热处理和非热处理条件下的数据进行了比较。可以发现，未经任何热处理的试样的疲劳数据与试样的数据更为吻合。