| Study on the formation mechanism of α lamellae in a near β titanium alloy |
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| 作者姓名： | Bin Tang Hongchao Kou Xue Zhang Puyi Gao Jinshan Li |
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| 作者单位： | State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, No. 127, Youyi Xilu, Xi’an, Shaanxi 710072, China;State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, No. 127, Youyi Xilu, Xi’an, Shaanxi 710073, China;State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, No. 127, Youyi Xilu, Xi’an, Shaanxi 710074, China;State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, No. 127, Youyi Xilu, Xi’an, Shaanxi 710075, China;State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, No. 127, Youyi Xilu, Xi’an, Shaanxi 710076, China |
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| 摘 要： | In order to obtain more insight in the two existing mechanisms on the nucleation, i.e., sympathetic nucleation and interface instability nucleation, of α lamellae in the near β Ti alloys, the micro-texture ofα lamellae in Ti-7Mo-3Nb-3Cr-3Al has been investigated by using electron backscatter diffraction(EBSD).The results show that the α_(WGB) lamellae can not only grow up from α_(GB) grains by inheriting the orientations but also sympathetically nucleate at the α_(GB)/β interface during the slow cooling process. These observations provide the first direct experimental evidence that the formation mode of α lamellae in Ti-7333 alloy consists of sympathetic nucleation and interface instability nucleation. Based on the present results together with some previous studies on α phase transformation in Ti-based alloys the influence of β-stabilizers parameter on the change of formation mechanism of α lamellae was discussed.
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| 关 键 词： | Near β Ti alloys α Lamellae Sympathetic nucleation Interface instability nucleation Phase transformation |
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