MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
The Effect of TiB2 Particles on the Microstructure of Semi-Solid 7075 Alloy Slurry
Gui-sheng GanBin YangHuan-chuan WuJun HanQian GaoChang-hua Du
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2012 Volume 53 Issue 6 Pages 1178-1183

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Abstract

In situ reaction and low superheat degree pouring technologies have been successfully used to prepare semi-solid TiB2/7075 aluminum matrix composite slurry. The experimental results have shown that the TiB2 particulates become the stable nucleus of α-Al during the solidification of 7075 Al alloy. Moreover, high speed impact formed in the serpentine channel and stainless steel beaker is beneficial to get fine globular grains. The microstructure of 3 mass%TiB2/7075 composite is composed of uniform globular grains. The mean grain sizes and shape factors of the composite are 23 µm, 0.90 and 26 µm, 0.89 at 655°C pouring temperature when one or two curved channels were used respectively.

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© 2012 The Japan Institute of Metals and Materials
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