当前位置：首页 > 过刊浏览->2022年43卷第7期
高压铸造AlSi7MgMn合金热处理工艺研究
Heat Treatment of High Pressure Die Cast AlSi7MgMn Alloy
浏览(8130) 下载(22)
- DOI:
- 作者:
- 杨 洁 1，2 ，赵 越 1 ，闫康康 3 ，陈豫增 1 ，刘 峰 1
YANG Jie1,2, ZHAO Yue1 , YAN Kangkang3 , CHEN Yuzeng1 , LIU Feng1
- 作者单位:
- 1. 西北工业大学 凝固技术国家重点实验室，陕西 西安 710072；2. 国汽轻量化（江苏）汽车技术有限公司，江苏 扬州 225000；3. 陕西汽车控股集团有限公司 技术中心，陕西 西安 710200
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. China Automotive Lightweight Technology (Jiangsu) Co., Ltd., Yangzhou 225000, China; 3. Technology Center of Shaanxi Automobile Holding Group Co., Ltd., Xi'an 710200, China
- 关键词:
- 铸造铝合金；熔体冷却速率；凝固；热处理；组织与力学性能
cast aluminum alloy; melt cooling rate; solidification; heat treatment; microstructure and mechanical properties
- 摘要:
- 对高压压铸 AlSi7MgMn 合金采用退火+人工时效处理，研究了其组织与性能的演化。结果表明，退火+人工
时效处理可以在铝基体内部析出纳米 Si 颗粒，使材料变形过程中位错在铝晶粒内部发生缠结和存储，提高材料塑性变
形的能力；人工时效后，在铝基体内析出针状 β″相，可显著阻碍位错的运动，产生析出强化效应。 与压铸态相比，采用两
步热处理工艺合金的屈服强度达到 150 MPa，提高了 25%，断后伸长率没有下降，达到 9%。
High pressure die cast AlSi7MgMn alloy was annealed and artificially aged, and the evolution of its microstructure and properties was studied. The results show that annealing and artificial aging treatment can precipitate nano Si particles in the aluminum matrix, so that dislocations are entangled and stored in the aluminum grains during the deformation process, and the ability of plastic deformation of the material is improved. After artificial aging, the precipitated β″ phases in aluminum matrix can significantly hinder the movement of dislocation and produce precipitation strengthening effect. Compared with the die-cast state, the two-step heat treatment process can increase the yield strength of the alloy to 150 MPa, increased by 25%, and the elongation after fracture of the alloy is 9%, not decreased.