Precipitation in an A1-0.212 wt.% Au alloy期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Precipitation in an A1-0.212 wt.% Au alloy

Affiliation:	1. Engineering Design & Development Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085, Maharashtra, India;2. Homi Bhabha National Institute, Anushaktinagar, Mumbai-400094, India;3. Materials Science Division, Bhabha Atomic Research Centre, Mumbai- 400085, India;4. Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085, Maharashtra, India;5. Materials Group, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085, Maharashtra, India;1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA;2. The Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee, Knoxville, TN, USA;3. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, USA;4. Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA;1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States;2. The Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee, Knoxville, TN, United States;3. Materials Science and Engineering, University of Tennessee, Knoxville, TN, United States;4. Computational Science and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States;5. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States;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;2. School of Aviation and Mechanical Engineering, Changzhou Institute of Technology, Changzhou 213032, China

Abstract:	Electron microscope observations show that aging a supersaturated solid solution of Al-0.212 wt.% Au alloy produces a distribution of plate precipitates of the equilibrium phase η (AuAl₂) on the matrix cube planes without the formation of any metastable phases (contrary to previous report). Dislocations in the matrix act as heterogeneous sites for the nucleation of these precipitates. The large coherency strain field due to a mismatch of 4.8% parallel to their broad faces gives rise to a large age-hardening effect. Misfit dislocations nucleated at longer ageing times to accommodate the mismatch reduce this effect.

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