【作者】 黄婷； 杨林； 任玉艳； 林立； 刘正；

【Author】 HUANG Ting,YANG Lin,REN Yu-yan,LIN Li,LIU Zheng (School of Materials Science and Engineering,Shenyang University of Technology, Shengyang 110870,Liaoning,China)

【机构】 沈阳工业大学材料科学与工程学院；

【摘要】 研究了退火处理对AZ91镁合金经固溶处理及常温压缩后显微组织及硬度的影响。结果表明:AZ91镁合金在常温压缩过程中产生大量孪晶,为β-MMg₁₇Al₁₂相的析出及静态再结晶提供了有利的形核条件;退火过程中β-Mg₁₇Al₁₂相先沿孪晶界和晶界析出,250℃退火时,随时间的延长,β-Mg₁₇Al₁₂相析出量不断增加,孪晶界逐渐变宽,同时析出相的排列具有一定的方向性;在变形量为8%时,250～350℃×2 h退火时未发生再结晶;当变形量为10%时,在350℃退火时则发生明显静态再结晶;退火后材料的硬度值受变形量、析出物含量等因素影响,发生了很大变化。更多还原

【Abstract】 The effect of annealing treatment on the microstructure and hardness of AZ91 alloy with solidsolution treatment and compression processing at room temperature was investigated.The experimental results show that lots of twins are generated in the compression process of AZ91 alloy at room temperature, and the twins serves as beneficial nucleation condition both forβ-Mg₁₇Al₉12) phase precipitation and static recrystallzation.In the annealing process,theβ-MMg₉17)Al₉12) phase precipitates preferntially at twin and grain bounbaries.In the annealing process at 250℃,the precipitation amont ofβ-Mg₁₇Al₁₂ phase continuously increases,and the twin boundaries get wider gradually with prolonging the aging time; Meanwhile,certain orientation relationships were also discovered among theβ-Mg₁₇Al₁₂ phase precipitated in twinning and theα-Mg matrix;When the deformation is 8%,no recrystallzation occures under 250³50℃×2 h annealing condition.When the deformation reaches 10%,obvious static recrystallzation happens after annealing at 350℃.The hardness of AZ91 alloy changes dramatically after annealing,which depends on such factors as deformation and precipitate amount.。更多还原