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| Internal Friction Analysis of Transformations in Au-Cu-Al Alloy |
| JIN Mingjiang,GU Yijia,JIN Xuejun |
| (School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract The phase transformation in the asquenched and aged Au7Cu5Al4 alloys were investigated by internal friction technique. The results show that Ms temperatures of the asquenched and aged Au7Cu5Al4 alloys are -2.7 °C and 13.8 °C, respectively. The boundary relaxation activation energy for the quenched and aged Au7Cu5Al4 alloys were calculated for 131.5 kJ/mol and 93.0 kJ/mol, respectively, which indicates the difference of ordering states of the parent phases resulted by different thermal history. By high temperature internal friction measurement it is found that the B2→L21 ordering transition is interrupted by quenching and the parent phase state of quenched Au7Cu5Al4 alloy shows B2 ordering, which suppresses martensitic transformation.
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Received: 09 May 2009
Published: 31 May 2010
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