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

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

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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.

aluminum matrix compositesaging treatmentpowder metallurgymechanical propertiesprecipitation

CHEN YunTao、MA GuoNan、ZHU ShiZe、WANG Dong、XIAO BoLv、MA ZongYi

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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

Centre of Excellence for Advanced Materials,Dongguan 523808,China

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaGuangdong Basic and Applied Basic Research FoundationChina Postdoctoral Science FoundationNatural Science Foundation of Liaoning ProvinceLiaoning Revitalization Talents Program

2022YFB3707405U22A20114523012002021A15151105252023M7335732023-BS-020XLYC2007009

2024

10.1007/s11431-024-2658-y

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
年,卷(期)：2024.67(8)
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