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Competition Growth of α and β Phases in Ti-50 at.%Al Peritectic Alloy during the Rapid Solidification by Laser Melting Technique

查看全文 作　　者：Wenjing [1]YAO;Xiuling [1]NIU;Long [1]ZHOU;Nan [1]WANG;Jehyun [2]LEE 高影响力作者 机构地区：[1]The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University;[2]Engineering Research Center for Integrated Mechatronics Materials and Components, Changwon National University,92 Toechon-ro, Uichang-gu Changwon-si高影响力机构 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2013年第26卷第5期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundations of China Nos.51271149 and 50901060);the National Basic Research Program of China(No.2011CB610404);the National Aerospace Science Foundation of China(No.2010ZF53059);the NPU Foundations for Fundamental Research(No.NPUJC20110279);the Fund of the Innovation Base of Graduate Students of NPU;supported partly by the National Research Foundation of Korea(No.2012-0009451) 摘　　要：Rapid solidification of Ti-50 at.%Al peritectic alloy is realized by laser melting technique at diferent conditions of laser power and scanning speed.The temperature field and the cooling rate under the corresponding conditions are derived from the finite element simulation.Comparing the measured pool size with the simulated result,the laser absorptivity of Ti-50 at.%Al peritectic alloy at diferent conditions can be deduced to establish the relationships between the laser absorptivity,the laser power and the scanning speed.The morphology evolution and the phase selection of Ti-50 at.%Al peritectic alloy are described by the temperature gradient and the cooling rate.With the increase of temperature gradient and cooling rate,βphase replacesαphase to become the leading growth phase.And the growth ofαphase experiences the transition from facet to non-facet manner,whileβphase is refined.To understand the underlying mechanism of the competition growth can bring benefit to the industrial application of Ti-Al alloy. 关 键 词：TI-AL合金 激光功率 包晶合金 熔炼技术 快速凝固 竞争 有限元模拟 扫描速度
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