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

doi:10.1007/s40195-013-0085-0

Acta Metallurgica Sinica (English Letters)

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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

Wenjing YAO¹⁾, Xiuling NIU¹⁾, Long ZHOU¹⁾, Nan WANG¹⁾ , Jehyun LEE²⁾

1)The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710072, China
2) Engineering Research Center for Integrated Mechatronics Materials and Components, Changwon National University, 92 Toechon-ro, Uichang-gu Changwon-si, Gyeongnam 641-773, Republic of Korea

Received:2013-02-11 Revised:2013-05-07 Online:2013-10-25 Published:2013-09-13
Contact: Nan WANG
Supported by:
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. NPU-JC20110279) and the Fund of the Innovation Base of Graduate Students of NPU. It was also supported partly by the National Research Foundation of Korea (No.2012-0009451).

Abstract

Abstract:

Rapid solidification of Ti-50 at.%Al peritectic alloy is realized by laser melting technique at different 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 different 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, β phase replaces α phase to become the leading growth phase. And the growth of α phase experiences the transition from facet to non-facet manner, while β phase is refined. To understand the underlying mechanism of the competition growth can bring benefit to the industrial application of Ti-Al alloy.

Key words: Rapid solidification, Laser melting, Competition growth, Temperature field

Wenjing YAO, Xiuling NIU, Long ZHOU, Nan WANG, Jehyun LEE. Competition Growth of α and β Phases in Ti-50 at.%Al Peritectic Alloy during the Rapid Solidification by Laser Melting Technique[J]. Acta Metallurgica Sinica (English Letters), DOI: 10.1007/s40195-013-0085-0.

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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

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