Microscopic Characterization of Semi-Solid Ti14 Alloy |
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Authors: | Chen Yongnan Wei Jianfeng Zhao Yongqing Ma Xuedan Hao Jianmin |
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Affiliation: | 1 Chang’an University,Xi’an 710064,China;2 State-key Laboratory for Mechanical Behavior of Material,Xi’an Jiaotong University,Xi’an 710049,China;3 Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China |
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Abstract: | The microstructural evolution and the element distribution of Ti14(α+Ti2Cu) alloy during semi-solid compres-sion were investigated.Moreover,the Ti2Cu precipitate behaviors were discussed in detail.The results show that the micro-structure,the number and distribution of Ti2Cu precipitates have significant dependence on the process parameters.More Ti2Cu will precipitate on grain boundaries at a higher deformation temperature,and/or a lower strain rate as well as defor-mation ratio,and finally a network structure is formed after deformation at 1100 °C.The precipitation on grain boundaries is found to be mainly controlled by peritectic reactions.The elevated temperatures resulted in more liquid along the prior grain boundaries,and a Cu-rich region is formed,finally.the "coarse" grain boundaries appear during re-solidification. |
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Keywords: | titanium alloy semi-solid state microstructural evolution precipitate |
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