材料科学技术(英文版)2022，Issue(19) ：191-205.

Stress-controlled fatigue of HfNbTaTiZr high-entropy alloy and associated deformation and fracture mechanisms

Shuying Chen Weidong Li Ling Wang Tao Yuan Yang Tong Ko-Kai Tseng Jien-Wei Yeh Qingang Xiong Zhenggang Wu Fan Zhang Tingkun Liu Kun Li Peter K.Liaw
材料科学技术(英文版)2022，Issue(19) ：191-205.
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  • 维普
  • 万方数据

Stress-controlled fatigue of HfNbTaTiZr high-entropy alloy and associated deformation and fracture mechanisms

Shuying Chen 1Weidong Li 2Ling Wang 2Tao Yuan 3Yang Tong 1Ko-Kai Tseng 4Jien-Wei Yeh 4Qingang Xiong 5Zhenggang Wu 6Fan Zhang 7Tingkun Liu 2Kun Li 8Peter K.Liaw2
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作者信息

  • 1. Institute for Advanced Studies in Precision Materials,Yantai University,Yantai 264005,China
  • 2. Department of Materials Science and Engineering,The University of Tennessee,Knoxville,TN 37996,USA
  • 3. Department of Industrial and Systems Engineering,Ohio University,Athens,OH 45701.USA
  • 4. Department of Materials Science and Engineering,High Entropy Materials Center,National Tsing Hua University,Hsinchu.30013,Taiwan,China
  • 5. State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China;School of Light Industry and Engineering,South China University of Technology,Guangzhou 510640,China
  • 6. College of Materials Science and Engineering,Hunan University,Changsha 410082,China
  • 7. WPI Advanced Institute for Materials Research,Tohoku University,Sendai 980-8577,Japan
  • 8. State Key Laboratory of Mechanical Transmission,Chongqing University,Chongqing 400044,China
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Abstract

The stress-controlled fatigue tests are carried out at a stress ratio of 0.1 and a frequency of 10 Hz,and span both low-cycle and high-cycle regimes by varying the applied stress amplitudes.The high-cycle fa-tigue regime gives a fatigue strength of 497 MPa and a fatigue ratio of 0.44.At equivalent conditions,the alloy's fatigue strength is greater than all other high-entropy alloys(HEAs)with reported high-cycle fatigue data,dilute body-centered cubic alloys,and many structural alloys such as steels,titanium al-loys,and aluminum alloys.Through in-depth analyses of crack-propagation trajectories,fracture-surface morphologies and deformation plasticity by means of various microstructural analysis techniques and theoretical frameworks,the alloy's remarkable fatigue resistance is attributed to delayed crack initiation in the high-cycle regime,which is achieved by retarding the formation of localized persistent slip bands,and its good resistance to crack propagation in the low-cycle regime,which is accomplished by intrin-sic toughening backed up by extrinsic toughening.Moreover,the stochastic nature of the fatigue data is neatly captured with a 2-parameter Weibull model.

Key words

Fatigue mechanisms/Intrinsic toughening/Extrinsic toughening/Probabilistic modeling

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基金项目

Department of Energy(DOE)Office of Fossil Energy,National Energy Technology Laboratory(NETL)(DE-FE-0011194)

National Science Foundation(DMR1611180)

National Science Foundation(1809640)

U.S.Army Office Projects(W911NF-13-1-0438)

U.S.Army Office Projects(W911NF-19-2-0049)

国家自然科学基金(52001271)

Shan-dong Major Scientific and Technological Innovation Program,China(2019JZZY010325)

出版年

2022
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)

CSTPCDCSCDSCI
影响因子：0.657
ISSN：1005-0302
参考文献量81
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