成都航空职业技术学院;重庆大学机械与运载工程学院;重庆大学高性能结构增材制造重庆市重点实验室;重庆大学高端装备机械传动全国重点实验室;
由于稀土(RE)元素在激光粉末床熔融(Laser powder bed fusion, LPBF)制备的WE43合金中具有超高的固溶度,因此本文省去固溶处理过程,直接对其进行T5时效处理,研究了T5时效处理对其微观组织、物相、缺陷以及拉伸性能的影响。结果表明:T5时效处理后,WE43合金中的椭圆形和鱼鳞纹组织消失,平均晶粒尺寸由2μm长大至8.5μm,稀土相由点状弥散分布在α-Mg晶体内转变为连续或较小间距的分布在晶界处,形状为碟状或片状、针状,整体分布均匀;T5时效处理后WE43合金的屈服强度、抗拉强度和伸长率相对于LPBF态分别下降了12.6%、10.7%和6.6%,其力学性能降低的原因可归因于以下3个方面:时效后合金的晶粒尺寸增大;时效后连续或较小间距分布于晶界处的脆性析出相破坏了晶界的连续性,以及微孔等缺陷依然存在;时效后稀土元素从α-Mg基体中析出,导致其在α-Mg基体中的固溶度降低;但稀土原子在α-Mg中的固溶度对LPBF制备的WE43合金塑性的影响程度相对较低。
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基本信息:
DOI:10.13289/j.issn.1009-6264.2024-0344
中图分类号:TG156.92;TG665;TG146.22
引用信息:
[1]岳太文,王秋林,门正兴等.T5时效对激光粉末床熔融制备的WE43合金组织和性能的影响[J].材料热处理学报,2025,46(05):44-53.DOI:10.13289/j.issn.1009-6264.2024-0344.
基金信息:
国家自然科学基金(52201105); 四川省自然科学基金(2023NSFSC0407,2022NSFSC0324); 成都航空职业技术学院重点自然科研项目(ZZX0623069); 成都市哲学社会科学重点研究基地-成都航空产业发展与文化建设研究中心项目(CAIACDRCXM2024-13)