Two-stage aging treatment to accelerate aging kinetics without impairing strength in B4C/7A04Al composite

CHEN YunTao ¹MA GuoNan ²ZHU ShiZe ³WANG Dong ³XIAO BoLv ³MA ZongYi³

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作者信息

1. Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China
2. Centre of Excellence for Advanced Materials,Dongguan 523808,China
3. Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China
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Abstract

Aging treatments are the key process to obtain satisfactory strength for 7xxxAl alloys and their composites.However,traditional single-stage(SS)aging is time-consuming to reach a peak strength condition.In this study,an efficient 120℃+160℃ two-stage(TS)aging treatment was proposed on a B4C/7A04Al composite fabricated via powder metallurgy(PM)technology,which could acquire similar peak-aging strength but only took about 15％of the time compared to traditional 120℃ SS aging.The evolution of precipitation during the TS aging was investigated,as well as those of the 7A04Al alloys for comparison.In the second stage aging process,the higher aging temperature accelerated the nucleation of η'phases inside the grains and thus increased the density of precipitates.Moreover,the short aging time limited the coarsening of precipitates and the broadening of precipitate-free zones.The above factors were beneficial for quickly obtaining satisfactory precipitation strengthening effects.The B4C/7A04Al composite exhibited slower aging kinetics than the 7A04Al alloy in the TS aging.Mg elements consumption by the chemical reaction between B impurities introduced by B4C particles and the Al matrix was considered to potentially retard the aging kinetics of the B4C/7A04Al composite.Nevertheless,the precipitation sequence was not affected.

Key words

aluminum matrix composites/aging treatment/powder metallurgy/mechanical properties/precipitation

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基金项目

National Key R&D Program of China(2022YFB3707405)

National Natural Science Foundation of China(U22A20114)

National Natural Science Foundation of China(52301200)

Guangdong Basic and Applied Basic Research Foundation(2021A1515110525)

China Postdoctoral Science Foundation(2023M733573)

Natural Science Foundation of Liaoning Province(2023-BS-020)

Liaoning Revitalization Talents Program(XLYC2007009)

出版年

2024

中国科学:技术科学(英文版)

中国科学院

中国科学:技术科学(英文版)

CSTPCDEI

影响因子：1.056

ISSN：1674-7321

参考文献量1

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