Microstructural refinement and mechanical property improvements of Ti-5Al-1Sn-1V-1Zr-0.76Mo alloy by equal channel angular extrusion processing

被引：1

作者：

Protasov, Vadim ^{[1
]}

Colombo, Gian ^{[1
]}

Sastry, Shankar M. L. ^{[1
]}

机构：

[1] Washington Univ, St Louis, MO 63130 USA

来源：

PRICM 6: SIXTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-3 | 2007年 / 561-565卷

关键词：

D O I：

10.4028/www.scientific.net/MSF.561-565.175

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Severe plastic deformation (SPD) by equal channel angular extrusion (ECAE) was investigated as a way to produce ultra fine grain (UFG) microstructure in Ti-5A1-1Sn-1V-1Zr-0.76Mo. DEFORM 3D Finite Element Model (FEM) was used to predict loads and strain distribution associated with ECAE which were validated experimentally The effects of resulting ultra fine grain microstructure on room temperature mechanical properties and high temperature super plasticity were investigated. ECAE processing: resulted in the conversion of coarse Widmanstatten structure to fine equiaxed microstructure with an average grain size of 4 mu m. The alloy with fine grained equiaxed microstructure has 20- 25% higher yield strength, 15% higher ultimate tensile strength, and 50-100% higher % elongation to fracture and % reduction in area compared to the as received alloy containing coarse Widmanstatten microstructure. The ECAE processed alloy exhibits attractive superplastic formability charactersistics at 900-950 degrees C with m value >0.4, flow stresses < 20 MPa, and superplastic elongations > 200%.

引用

页码：175 / 178

页数：4

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