热处理工艺对挤压7175铝合金组织性能的影响  

Influence of heat treatment process on microstructure and properties of extruded 7175 aluminum alloy

作　　者：师晓宁 刘一笑 Shi Xiaoning;Liu Yixiao(Department of Mechanical and Electrical Engineering,Langfang Yanjing Vocational Technical College,Langfang 065200,China;College of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China)

机构地区：[1]廊坊燕京职业技术学院机电工程系,河北廊坊065200 [2]河北科技大学材料科学与工程学院,河北石家庄050018

出　　处：《锻压技术》2024年第2期234-240,共7页Forging & Stamping Technology

基　　金：河北省自然科学基金重点资助项目(E2018203339)。

摘　　要：探究了不同压力(0、25、50和75 MPa)下挤压铸造对7175铝合金的微观组织和力学性能的影响。结果表明:相较于非压力铸造,挤压铸造的显微组织更为致密、缺陷更少;7175铝合金在120和180℃时效处理后,硬度和沉淀相的数量随着压力的增加而增加;挤压铸造进一步提高了7175铝合金的耐热性,这主要是由于晶粒细化效应。在120℃+130 min时效处理时,由于凝固时间缩短,挤压铸造7175铝合金的磨损损失量相较于非压力铸造显著减少,最终获得高密度的析出物、细小晶粒和均匀分布的共晶组织。本研究为7175铝合金的制备工艺和性能优化提供了重要的支持与参考。Influence of extrusion casting on the microstructure and properties of 7175 aluminum alloy under different pressures(0,25,50 and 75 MPa)was esplored.The results show that compared with non-pressure casting,the microstructure of extrusion casting is denser and there are fewer defects.After aging treatment at 120 and 180 C for 7175 aluminum alloy,the hardness and number of precipitation phases increase with the increasing of pressure.Extrusion casting further improves the heat resistance of 7175 aluminum alloy,mainly due to the grain refinement effect.During the aging treatment at 120 C+130 min,due to the shortened solidification time,the wear loss of 7175 aluminum alloy by estrusion casting is significantly reduced compared to non-pressure casting,and high-density precipitates,fine grains and uniformly distributed eutectic structure are finally obtained.This study provides important support and reference for the prepara-tion process and performance optimization of 7175 aluminum alloy.

关 键 词：7175铝合金 挤压铸造 磨损失重 非压力铸造 冷却速度 凝固组织 

分 类 号：TG376.1[金属学及工艺—金属压力加工]