材料科学技术(英文版)2024，Vol.172Issue(5) ：71-82.DOI:10.1016/j.jmst.2023.06.038

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

Xiang Su Yuan Lei Yang Chen Hongjie Qu Zhixiang Qi Gong Zheng Xu Liu Henggao Xiang Guang Chen
材料科学技术(英文版)2024，Vol.172Issue(5) ：71-82.DOI:10.1016/j.jmst.2023.06.038
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Precipitating thermally reinforcement phase in aluminum alloys for enhanced strength at 400 ℃

Xiang Su 1Yuan Lei 2Yang Chen 2Hongjie Qu 2Zhixiang Qi 2Gong Zheng 2Xu Liu 2Henggao Xiang 2Guang Chen2
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作者信息

  • 1. 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
  • 2. 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
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Abstract

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.

Key words

Aluminum alloys/Precipitation/Thermally reinforcement phase/Re-aging treatment/High-temperature strength

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基金项目

National science Foundation of China(92163215)

National science Foundation of China(52174364)

National science Foundation of China(52101143)

National science Foundation of China(51731006)

National science Foundation of China(51771093)

National science Foundation of China(12202201)

Natural Science Foundation of Jiangsu Province Major Project(BK20212009)

Fundamental Research Funds for the Central Universities(30922010202)

Fundamental Research Funds for the Central Universities(30922010711)

China Postdoctoral science Foundation(2021M691582)

Natural Science Foundation of the Jiangsu Higher Education Institutions of China(22KJD430002)

Natural Science Foundation of the Jiangsu Higher Education Institutions of China(23KJA430003)

出版年

2024
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
参考文献量86
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