首页|Al?Zn?Mg?Cu合金异构组织内沉淀和溶质分布的理论设计和过程调控

Al?Zn?Mg?Cu合金异构组织内沉淀和溶质分布的理论设计和过程调控

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为了同时提高Al−Zn−Mg−Cu合金强度和成形性能,构建析出相和溶质元素浓度分布理论模型,并对合金内异构组织进行理论设计和过程调控.研究结果表明,沉淀相的溶解主要受其尺寸和热处理温度影响,溶质元素在合金基体中扩散所形成的异构组织特征主要取决于晶粒尺寸,而热处理温度仅对较大尺寸晶粒内的溶质元素浓度分布有显著影响.上述理论预测Al−Zn−Mg−Cu合金内的沉淀相和溶质元素分布情况与实测结果较为吻合.此外,通过有效控制Al−Zn−Mg−Cu合金内沉淀相和溶质元素浓度分布可以更好地精准构筑微区异构组织,从而更大幅度地改善合金的成形性能.
Theoretical design and distribution control of precipitates and solute elements in Al−Zn−Mg−Cu alloys with heterostructure
In order to simultaneously improve strength and formability, an analytical model for the concentration distribution of precipitates and solute elements is established and used to theoretically design and control the heterogeneous microstructure of Al−Zn−Mg−Cu alloys. The results show that the dissolution of precipitates is mainly affected by particle size and heat treatment temperature, the heterogeneous distribution level of solute elements diffused in the alloy matrix mainly depends on the grain size, while the heat treatment temperature only has an obvious effect on the concentration distribution in the larger grains, and the experimental results of Al−Zn−Mg−Cu alloy are in good agreement with the theoretical model predictions of precipitates and solute element concentration distribution. Controlling the concentration distribution of precipitates and solute elements in Al−Zn−Mg−Cu alloys is the premise of accurately constructing heterogeneous microstructure in micro-domains, which can be used to significantly improve the formability of Al−Zn−Mg−Cu alloys with a heterostructure.

Al−Zn−Mg−Cu alloysconcentration distributiondiffusionheterogeneous microstructuremodel

袁亮亮、郭明星、鄢勇、冯伟俊、刘赞扬、庄林忠

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北京科技大学 新金属材料国家重点实验室,北京100083

北京科技大学 北京现代交通金属材料与加工实验室,北京 100083

宝山钢铁股份有限公司 宝钢中央研究院 宝武铝业技术中心,上海 201900

中国宝武钢铁集团 三门峡铝基新材料研发中心,山门峡 472099

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Al−Zn−Mg−Cu合金 浓度分布 扩散 异构组织 模型

This work was financially supported by the National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaGovernment Guided Program-Intergovernmental Bilateral Innovation Cooperation Project,Chinaand the Opening Project of State Key Lab of Advanced Metals and Materials,China

2021YFE0115900Nos.518710295157102351301016BZ20190192020-ZD02

2021

10.1016/S1003-6326(21)65732-1

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(11)
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