铸态晶粒尺寸对AZ91合金固溶时效行为的影响  

Effect of As-cast AZ91 Alloy Grain Size on Behaviors of Solid Solution and Ageing Treatment

作　　者：王学玉[1] 王春建[1] 金青林[1] 蒋业华[1] 周荣[1] 

机构地区：[1]昆明理工大学机电学院,云南昆明650093

出　　处：《铸造技术》2009年第3期381-384,共4页Foundry Technology

基　　金：云南省教育厅科学研究基金(07Y11361)

摘　　要：研究铸态晶粒尺寸对AZ91合金固溶时效组织的影响,并对析出相与合金显微硬度之间的关系进行了分析。结果表明,合金铸态晶粒尺寸越小,其固溶效率越高,时效处理时β相的连续析出速度越快;在时效处理过程中,无论铸态晶粒尺寸或大或小,合金的显微硬度值都随着连续析出的β相数量的增加先升高后降低;并且铸态晶粒尺寸越小,其硬度峰值越高,达到峰值所用的时间越短。The effect of as-cast grain size on the microstructures of AZ91 alloy after solid solution and aging treatment was investigated,and the relationship between precipitation phase and micro-hardness was analyzed.The results show finer grain can improve the solubility of AZ91 alloy and accelerates the precipitation of βphase during ageing treatment.Whether grain size of the alloy is small or large,the micro-hardness always increases first and then decreased during ageing treatment.Finer grain can effectively sh...

关 键 词：AZ91镁合金 时效处理 析出相 显微硬度 

分 类 号：TG156.9[金属学及工艺—热处理]