Competition growth of Emphasis Type="Italic"α/E

Authors: Wenjing Yao Xiuling Niu Long Zhou Nan Wang Jehyun Lee

Publish Date: 2013/09/17

Volume: 26, Issue: 5, Pages: 523-532

PDF Link

Abstract

Rapid solidification of Ti50 atAl 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 Ti50 atAl 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 Ti50 atAl 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 nonfacet manner while β phase is refined To understand the underlying mechanism of the competition growth can bring benefit to the industrial application of TiAl alloy

Keywords: