Microstructure Evolution and Recrystallization Resistance of a 7055 Alloy Fabricated by Spray Forming Technology and by
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ZHIQIANG XIE, KAIYUN XIANG, YAPING KONG, and ZHENGUO LI are with the International Joint Laboratory for Light Alloys (Ministry of Education), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China. ZHIHONG JIA is with the International Joint Laboratory for Light Alloys (Ministry of Education), College of Materials Science and Engineering, Chongqing University and also with the Electron Microscopy Center of Chongqing University, Chongqing 400044, China and also with the Key Laboratory for Light-Weight Materials, Nanjing Tech University, Nanjing 210009, China. Contact e-mail: [email protected] XI FAN and HAO ZHANG are with the Jiangsu Haoran Spray Forming Alloy Co., Ltd., Zhenjiang 212009, China. WANTAI MA is with the College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. LIN LIN is with the Southwest Aluminium (Group) Co., Ltd., Chongqing 401326, China. KNUT MARTHINSEN is with the Department of Materials Science and Engineering, NTNU - Norwegian University of Science and Technology, Alfred Getz vei 2b, 7491 Trondheim, Norway. QING LIU is with the International Joint Laboratory for Light Alloys (Ministry of Education), College of Materials Science and Engineering, Chongqing University and also with the Key Laboratory for LightWeight Materials, Nanjing Tech University. Manuscript submitted March 8, 2020.
METALLURGICAL AND MATERIALS TRANSACTIONS A
INTRODUCTION
7055 Al-Zn-Mg-Cu alloy is an important member of the 7xxx series alloys and is extensively used in the aerospace industry owing to its light weight and high mechanical performance.[1] Many attempts have been made to further improve the mechanical properties of the 7055 aluminum alloy. Improvement in the performance of most aluminum alloys can be attributed to modifications of chemical composition and/or employing new production methods.[2–5] The spray forming technology is an advanced fabrication technique, which is based on rapid solidification and powder metallurgy.[6] The success of spray deposition can possibly also be exploited to enhance the performance of 7055 aluminum alloys. Compared with conventional ingot metallurgy, the spray forming technology provides possibilities to avoid many unfavorable factors that generally are detrimental to the performance of aluminum alloys, such as large grains, serious compositional segregation, and severe casting defects due to low solidification rate. Most importantly, a uniform distribution of chemical composition and microstructure can be obtained because of the rapid solidification that is an inherent feature of the spray deposition process.[7–11]
Therefore, the spray forming technology possibly provides an alternative route to develop high-strength aluminum alloys. A homogenization heat treatment is an indispensable process for traditional casting alloys, aiming at dissolving large size eutectic phases, redistributing the solute, eliminating intragranular segregations, i.e., level out compositional variations,
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