Investigation on transformation of grain size and lamellar space in centrifugal cast TiAl-based alloy

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作者：
School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, China [1 ]
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来源：
Dongbei Daxue Xuebao | 2007年 / SUPPL. 2卷 / 6-9期
关键词：
Aluminum alloys - Centrifugal casting - Hot isostatic pressing;
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摘要：
In this paper, samples with target component Ti-48Al-2Cr-2Nb(at.%) were cast in permanent mold by the centrifugal casting method and Hot Isostatic Pressed (HIP) at 1270°C/173 MPa/4 h. The variation of lamellar space, grain size, as well as the effect of HIP on precipitation of γ-phase was investigated in detail. Results showed that the minimum grains existed near the boundary and the maximum ones appeared in medial region in selected cross-section of TiAl-base alloy, and the size variations of lamellar space and γ-phase were parabolic. In addition, the expressions regarding the distribution of lamellar space, as well as the γ-phase size in selected cross-section were obtained.
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