预处理对Al-Mg-Si合金蠕变时效行为及力学性能的影响
Effects of Pre-Treatments on Creep Aging Behaviors and Mechanical Properties of Al-Mg-Si Alloy
DOI: 10.12677/MS.2021.111006, PDF,    科研立项经费支持
作者: 罗书径：中南大学材料科学与工程学院，湖南 长沙；湖南省产商品质量监督检验研究院，湖南 长沙；高性能复杂制造重点实验室，湖南 长沙；邓运来, 戴青松, 王 宇：中南大学材料科学与工程学院，湖南 长沙；高性能复杂制造重点实验室，湖南 长沙
关键词: Al-Mg-Si合金；蠕变时效；预处理；应力位向效应；Al-Mg-Si Alloys； Creep Aging； Pre-Treatments； Stress Orientation Effects
摘要: 本文采用了蠕变曲线测试、室温拉伸及透射电镜等方法研究了不同预处理工艺(120℃/3 h预时效、5%预拉伸)对Al-Mg-Si合金在75 MPa/175℃条件下蠕变时效行为及其最终力学性能的影响。结果表明，引入预处理工艺能降低Al-Mg-Si合金的稳态蠕变速率和蠕变应变量；经7 h蠕变时效后，分别引入预时效和预拉伸后，试样的屈服强度分别较未作预处理的试样分别提高了16.2%、29.5%。透射电镜显微组织研究结果表明，预处理既能提高Al-Mg-Si合金中析出相的分布密度，同时又能消减合金在蠕变时效过程中产生的应力位向效应。本文的研究结果可为进一步提升Al-Mg-Si合金强度的工艺开发提供参考。
Abstract: Creep curves tests, tensile tests and transmission electron microscope (TEM) were conducted to study the effects of pre-treatments (120˚C/3 h pre-aging, 5% pre-stretching) on the creep behaviors and mechanical properties of Al-Mg-Si alloy under condition of 75 MPa applied load and aging temperature 175˚C in this paper. The results showed that the pre-treatments decreased the steady creep rate and creep strain of Al-Mg-Si alloy. After 7 h creep aging, the yield strengths of the pre-aged sample and pre-stretched sample were increased by 16.2%, 29.5%, respectively, when compared with the as-quenched sample. The results of TEM showed that the pre-treatments can increase the distribution density of the precipitates of Al-Mg-Si alloy, and can eliminate the stress orientation effect of the alloy during creep aging as well. The results of this paper can provide fa-vorable guidance for developing process to further improve the strength of Al-Mg-Si alloys.
文章引用：罗书径, 邓运来, 戴青松, 王宇. 预处理对Al-Mg-Si合金蠕变时效行为及力学性能的影响[J]. 材料科学, 2021, 11(1): 40-47. https://doi.org/10.12677/MS.2021.111006

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