Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第5期    总第62期    2004年5月

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文章编号:1004-0609(2004)05-0759-07
强变形诱导析出相回归后的再时效行为
许晓嫦, 刘志义, 张  坤, 郑青春, 叶呈武

(中南大学 材料科学与工程学院, 长沙 410083)

摘 要: 利用透射电镜和硬度测量实验手段,研究了强变形诱导析出相回归后的合金在再时效过程中的组织、 性能变化。 发现: 多相合金Al-Zn-Mg-Cu经固溶、 时效处理后, 析出相粒子在强变形过程中破碎细化并可重新回归于基体内。 强变形导致回归后的合金在再时效处理时可再次沉淀析出第二相粒子,但析出相的析出顺序与强变形后合金的晶粒尺有相关, 当晶粒细化到某一临界尺寸以下时, 析出顺序发生改变, 非均匀形核的平衡相可抑制GP区 、 η′亚稳相等前期粒子的析出。 

 

关键字: 强变形; Al-Zn-Mg-Cu合金; 时效析出相; 回归; 再时效

Re-ageing behavior of retrogressive precipitated phase caused by severe plastic deformation
XU Xiao-chang, LIU Zhi-yi, ZHANG Kun, 
ZHENG Qing-chun, YE Cheng-wu

School of Materials Science and Engineering, 
Central South University, Changsha 410083, China

Abstract: The microstructure and properties of an aged Al-Zn-Mg-Cu alloy associated with severe plastic deformation were studied by transmission electron microscopy and hardness measurement methods. The results show that the precipitates is fragmented and the retrogressive phenomenon of precipitated phase particles is caused by severe plastic deformation at room temperature condition. The sample which has retrogressive phenomenon precipitates the secondary phase during re-ageing treatment subsequently, and the reprecipitation sequence is due to the grain size caused by severe plastic deformation. There is a critical grain size below which the reprecipitation sequence changes, the heterogeneous precipitation of phase at grain boundaries would suppress precipitation of metastable phases such as GP zones and η′ phase.

 

Key words: severe plastic deformation; Al-Zn-Mg-Cu alloy; ageing precipitated phase; retrogression; re-ageing

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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