Coarsening Kinetics of Semi-solid A356–5wt%TiB2 in situ Composite

被引：0
|
作者：
S. Deepak Kumar
Mihira Acharya
A. Mandal
M. Chakraborty
机构：
[1] Indian Institute of Technology Bhubaneswar,School of Mechanical Sciences
[2] Indian Institute of Technology Bhubaneswar,School of Minerals, Metallurgical and Materials Engineering
[3] Indian Institute of Technology Kharagpur,Department of Metallurgical and Materials Engineering
来源：
Transactions of the Indian Institute of Metals | 2015年 / 68卷
关键词：
Cooling slope casting; Coarsening; A356 alloy; TiB; Ostwald ripening;
D O I：
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摘要：
An attempt has been made to investigate the coarsening behaviour of semisolid A356–5wt%TiB2 in situ composite produced by Cooling slope casting. It was found that the average grain size of α-Al in the gravity-cast alloy got reduced from 98 to 48 µm in the semi-solid A356–5TiB2 composite. The primary α-Al in the composite were found to undergo substantial spheroidisation after 5 min at a reheating temperature of 585 °C (fs = 0.5). Further, increase in holding time from 5 to 15 min resulted in grain growth of α-Al in both the alloy and the composites. The coarsening rate constant, K, for A356–5wt%TiB2 composite was found to be 339.73 μm3/s which is 32 % lower than that of semi-solid A356 alloy, thus proving the effectiveness of TiB2 particles towards grain coarsening.
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页码：1075 / 1080
页数：5
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