首页|Precipitating thermally reinforcement phase in aluminum alloys for enhanced strength at 400 ℃

Precipitating thermally reinforcement phase in aluminum alloys for enhanced strength at 400 ℃

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Heat-resistant aluminum alloys are widely used in aerospace and automotive fields for manufacturing hot components due to their advantages in lightweight design and energy conservation.However,the high-temperature strength of existing cast aluminum alloys is always limited to about 100 MPa at 350 ℃ due to coarsening and transformation of strengthening phases.Here,we reveal that the yield strength and ultimate tensile strength of the T6 state Al-8.4Cu-2.3Ce-1.0Mn-0.5Ni-0.2Zr alloy at 400 ℃ increase by 34％and 44％after re-aging at 300 ℃ for 100 h,and its thermal strength exhibits distinguished ad-vantage over traditional heat-resistant aluminum alloys.The enhanced elevated-temperature strength is attributed to the reprecipitation of the Ni-bearing T-Al20Cu2Mn3 phase,whose number density increases over one time.The significant segregation of Ni,Ce,and Zr elements at the interfaces helps improve the thermal stability of the T phase.The thermostable T phase effectively strengthens the matrix by in-hibiting dislocation motion.Meanwhile,a highly interconnected 3D intermetallic network along the grain boundaries can still remain after long-term re-aging at 300 ℃,which is conducive to imposing a drag on the grain boundaries at high temperatures.This finding offers a viable route for enhancing the elevated-temperature strength of heat-resistant aluminum alloys,which could provide expanded opportunities for higher-temperature applications.

Aluminum alloysPrecipitationThermally reinforcement phaseRe-aging treatmentHigh-temperature strength

Xiang Su、Yuan Lei、Yang Chen、Hongjie Qu、Zhixiang Qi、Gong Zheng、Xu Liu、Henggao Xiang、Guang Chen

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National Key Laboratory of Advanced Casting Technologies,MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology,Engineering Research Center of Materials Behavior and Design,Ministry of Education,Nanjing University of Science and Technology,Nanjing 210094,China

School of Aviation and Mechanical Engineering,Changzhou Institute of Technology,Changzhou 213032,China

National science Foundation of ChinaNational science Foundation of ChinaNational science Foundation of ChinaNational science Foundation of ChinaNational science Foundation of ChinaNational science Foundation of ChinaNatural Science Foundation of Jiangsu Province Major ProjectFundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central UniversitiesChina Postdoctoral science FoundationNatural Science Foundation of the Jiangsu Higher Education Institutions of ChinaNatural Science Foundation of the Jiangsu Higher Education Institutions of China

921632155217436452101143517310065177109312202201BK2021200930922010202309220107112021M69158222KJD43000223KJA430003

2024

10.1016/j.jmst.2023.06.038

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.172(5)
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