材料科学技术(英文版)2024，Vol.186Issue(19) ：79-90.DOI:10.1016/j.jmst.2023.10.041

Studies on thermal stability,softening behavior and mechanism of an ADS copper alloy at elevated temperatures

Feixiang Liu Xinhua Liu Guoliang Xie Yuan Wu Cunguang Chen
材料科学技术(英文版)2024，Vol.186Issue(19) ：79-90.DOI:10.1016/j.jmst.2023.10.041
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Studies on thermal stability,softening behavior and mechanism of an ADS copper alloy at elevated temperatures

Feixiang Liu 1Xinhua Liu 2Guoliang Xie 3Yuan Wu 3Cunguang Chen4
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作者信息

  • 1. Key Laboratory for Advanced Materials Processing(MOE),Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China
  • 2. Key Laboratory for Advanced Materials Processing(MOE),Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Beijing Laboratory of Metallic Materials and Processing for Modern Transportation,Institute for Advanced Materials and Technology,University of Science and Techno
  • 3. State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China
  • 4. Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China
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Abstract

An Al2O3 dispersion strengthened(ADS)alloy with an ultra-high softening temperature of～1200 K was fabricated by the in-situ internal oxidation and reduction methods.The evolution of the nanometer Al2O3 particles,grain size,and consequently the softening behavior of this ADS alloy,were investigated by con-ducting the annealing treatments in the range from 673 K to 1273 K for 60 min.These refined nanometer Al2O3 particles were found to be highly stable at elevated temperatures,leading to the high dislocation density and grain boundary stability of the matrix.The average grain size was found to increase extremely slowly from～0.60 μm to～0.74 μm with increasing annealing temperatures from 773 K to 1273 K.A cri-terion for grain boundaries migration and softening was established based on the competition between grain growth and pinning effect of Al2O3 particles.The strong pinning effect of Al2O3 particles was found when the grain size was between the lower limit(about 0.4-0.5 µm)and upper limit(2.18 µm).The occurrence of softening behavior was attributed to the rapid increase of the proportion of grains larger than the upper limit.A modified Hall-Petch relationship was established by introducing the integration of the grain size distribution,which can describe this correlation between softening behavior and the pinning effect of Al2O3 particles.The current study not only sheds light on the further understanding of the softening mechanism of ADS copper alloy but also provides a useful route for designing copper alloy with high softening resistance.

Key words

ADS copper alloy/Nanometer-scaled Al2O3 particles/Grain growth/Softening mechanism/Softening model

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基金项目

National Key Research and Development Program of China(2020YFB0311101)

National Natural Science Foundation of China(92066205)

National Natural Science Foundation of China(92266301)

Natural Science Foundation for Distinguished Young Scholars of China(51925401)

Youth Foundation of National Natural Science Foundation China(52001020)

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)

CSTPCDCSCD
影响因子：0.657
ISSN：1005-0302
参考文献量61
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