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Effects of high-pressure heat treatment on the solid-state phase transformation and microstructures of Cu61.13Zn33.94Al4.93 alloys |
| Wang Hai-Yan(王海燕)a), Liu Jian-Hua(刘建华)b), Peng Gui-Rong(彭桂荣)b)† , and Wang Wen-Kui(王文魁)b) |
| a Provincial Key Laboratory of Applied Chemistry, Yanshan University, Qinhuangdao 066004, China; b State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China |
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Abstract The phase transformation activation energy of the Cu61.13Zn33.94Al4.93 alloys, which were treated at 4 GPa and 700 ℃ for 15 minutes, was calculated by means of differential scanning calorimetry curves obtained at various heating and cooling rates. Then, the effects of high-pressure heat treatments on the solid-state phase transformation and the microstructures of Cu61.13Zn33.94Al4.93 alloys were investigated. The results show that high-pressure heat treatments can refine the grains and can change the preferred orientation from (111) to (200) of α phase. Compared with the as-cast alloy, the sample with high-pressure heat treatment has finer grains, lower β' → β and β → β ' transformation temperature and activation energy. Furthermore, we found that high cooling rate favours the formation of fine needle-like α phase in the range of 5–20 °C/min.
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Received: 23 March 2010
Revised: 17 May 2010
Accepted manuscript online:
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Cite this article:
Wang Hai-Yan(王海燕), Liu Jian-Hua(刘建华), Peng Gui-Rong(彭桂荣), and Wang Wen-Kui(王文魁) Effects of high-pressure heat treatment on the solid-state phase transformation and microstructures of Cu61.13Zn33.94Al4.93 alloys 2010 Chin. Phys. B 19 096203
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