殷培玲,孙瑜,武玉英.固溶时效对A356合金残余应力的影响机制研究[J].精密成形工程,2025,17(5):12-19.
YIN Peiling,SUN Yu,WU Yuying.Effect Mechanism of Solution and Aging Treatment on Residual Stress of A356 Alloy[J].Journal of Netshape Forming Engineering,2025,17(5):12-19. |
| 固溶时效对A356合金残余应力的影响机制研究 |
| Effect Mechanism of Solution and Aging Treatment on Residual Stress of A356 Alloy |
| 投稿时间：2025-01-03 |
| DOI：10.3969/j.issn.1674-6457.2025.05.002 |
| 中文关键词: A356合金 时效处理 残余应力 位错密度 (Mg2Si相) |
| 英文关键词: A356 alloy aging treatment residual stress dislocation density (Mg2Si phase) |
| 基金项目:山东省重点研发计划(2024CXPT104，YDZX2024123，2023CXPT024);山东省高端铝制造与应用创新创业共同体项目资助 |
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| 中文摘要: |
| 目的 探究固溶和时效处理对A356合金残余应力、力学性能以及微观组织的影响，揭示A356合金固溶处理和时效处理后微观组织与残余应力的关系。方法 以A356合金为研究对象，使用X射线衍射法检测残余应力，探究固溶、时效处理对合金残余应力的影响。通过布氏硬度测试探究固溶及时效对合金力学性能的影响。使用扫描电子显微镜和透射电子显微镜对合金的微观组织进行表征。结果 固溶处理使A356合金产生了较大的残余应力，而时效处理可以显著降低固溶处理产生的残余应力，与固溶态相比，时效处理4 h后，A356合金的残余应力降低了85.3 MPa。TEM分析表明，热时效使A356合金基体析出了大量的Mg2Si相，并且显著降低了位错密度，使晶格畸变降低。在此时效处理条件下，A356合金也能够保持较好的力学性能，布氏硬度值约为95HBW。结论 固溶处理使A356合金产生了较大的残余应力，时效处理4 h后，Mg2Si相的产生以及位错密度的降低不仅使固溶处理后A356合金的残余应力明显降低，还能够保持较好的力学性能。 |
| 英文摘要: |
| The work aims to investigate the effect of solution and aging treatment on residual stress, mechanical properties and microstructure of A356 alloy and reveal the relationship between microstructural changes and residual stresses in A356 alloys during solution treatment and aging treatment. With A356 alloy as the research object, the residual stress of the alloy was measured by X-ray diffraction to explore the effect of solution and aging treatment. Brinell hardness test was used to explore the effect of solution and aging treatment on mechanical properties. The microstructure of the alloy was characterized by scanning electron microscopy and transmission electron microscopy. Solution treatment caused a large residual stress in A356 alloy, while aging treatment significantly reduced the residual stress of the alloy caused by the solution treatment. Aging treatment for 4 hours resulted in an 85.3 MPa decrease in residual stress of the A356 alloy relative to that in the solution-treated state. TEM analysis showed that aging treatment caused a large amount of Mg2Si phases to precipitate in the A356 alloy matrix, and significantly reduced the dislocation density and lattice distortion. Under this aging treatment condition, A356 alloy could also maintain good mechanical properties and the Brinell hardness value was approximately 95HBW. The solution treatment causes significant residual stress in the A356 alloy, but the precipitation of Mg2Si phases and the reduction of dislocation density in aging treatment for 4 h not only significantly reduce the residual stress in the A356 alloy caused by solution treatment, but also make A356 alloy maintain good mechanical properties. |
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