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热处理工艺对变质后 A356 合金组织及 性能的影响
Effect of Heat Treatment Process on the Microstructure and Properties of A356 Alloy after Modification
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- DOI:
- 作者:
- 袁昌文 1 ，李 靖 1 ，王启航 1 ，苏小洁 2 ，黄中月 1
YUAN Changwen 1 , LI Jing 1 , WANG Qihang 1 , SU Xiaojie 2 , HUANG Zhongyue 1
- 作者单位:
- 1. 合肥工业大学 材料科学与工程学院，安徽 合肥 230009；2. 合肥市岐铭新材料科技发展有限公司，安徽 合肥 230031
1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China; 2. Hefei Qiming New Material Technology Development Co., Ltd., Hefei 230031, China
- 关键词:
- A356 合金；显微组织；力学性能；固溶处理；时效处理
A356 alloy; microstructure; mechanical properties; solution treatment; aging treatment
- 摘要:
- 变质后 A356 合金力学性能常常达不到工业使用要求，需通过热处理进一步强化。 本文以 Al-Sr-Y 合金变质后的 A356 合金为研究对象，应用 OM 、 SEM 、拉伸试验机等仪器研究固溶和时效处理对变质后 A356 合金显微组织与力学性能的影响，以此探索出一种适用于变质后 A356 合金的热处理工艺。 结果表明，经过 540 ℃×4 h+175 ℃×6 h 热处理后，共晶硅更加圆整和均匀，合金中强化元素 Mg 能够充分溶入基体，有利于时效过程析出强化相。 合金在热处理后抗拉强度、屈服强度、伸长率分别为 303.5 、 223.1 MPa 、 9.5% ，与铸态变质合金相比，分别提升了 57.7% 、 99.7% 、 20.3% 。此时，断口中韧窝尺寸增大，合金由脆性断裂转变成韧性断裂，塑性增强。
The mechanical properties of modified A356 alloys often fail to meet the requirements of industrial use, and need to be further strengthened by heat treatment. In this paper, the effect of solution and aging treatment on the microstructure and mechanical properties of A356 alloy modified by Al-Sr-Y alloy was studied by applying OM, SEM and tensile testing machine, so as to explore a heat treatment process applicable to the modified A356 alloy. The results show that the eutectic silicon after the heat treatment of 540 ℃×4 h+175 ℃×6 h is more rounded and uniform, and the strengthened element Mg in the alloy can be fully dissolved into the matrix, which is conducive to the precipitation of the strengthened phase during aging treatment. The tensile strength, yield strength, and elongation of the alloy after heat treatment are 303.5, 223.1 MPa and 9.5%, respectively, which are 57.7%, 99.7% and 20.3% higher than those of the as-cast modification alloy. The size of dimples in fracture increases, and the plasticity increases since it changes from brittle to ductile fracture.