Microstructure Evolution of TiB2/7075 Composites in Semi-Solid State near Liquids within Holding Time

Author:

Gan Gui Sheng1,Xia Da Quan1,Liu Xin2,Liu Cong1,Cheng Han Lin1,Ming Zhong Zhen1,Gao Hao Yang1,Yang Bin3

Affiliation:

1. Chongqing University of Technology

2. Chongqing Electromechanical Vocational Institute

3. University of Science and Technology Beijing

Abstract

Novel reactive technique has been employed in synthesis of 7075 Al matrix composites, and effect of TiB2 particles on sedimentation and microstructure of 7075 Al Alloy in near liquidus was investigated. Researchers have shown that 4.5%TiB2/7075 composites had the smallest grains and the minimum liquidus and solidus temperatures in 7075 Al matrix composites. 4.5%TiB2/7075 composites holding for 21 hours appeared stratification phenomenon, the globular grains were 61μm and 214μm, 250μm and 283μm with the increase of holding time respectively. The microstructures evolution of TiB2 /7075 composites holding for different time at 635°C was a two-stage mechanism that the globular grains was formed firstly and secondly sedimentation and layering were began after a period of time of Ostwald ripening. The globular grain continued to increase during the settling process.

Publisher

Trans Tech Publications, Ltd.

Subject

Condensed Matter Physics,General Materials Science,Atomic and Molecular Physics, and Optics

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