Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8002674 | Journal of Alloys and Compounds | 2013 | 6 Pages |
Abstract
The superplasticity of ultra-fine grained Ti-17 powder compact prepared through hot isostatic pressing and isothermal forging was investigated in the range of temperature from 780 °C to 920 °C and strain rate from 5 Ã 10â4 to 1 Ã 10â2 sâ1. A uniform microstructure with the size of many equiaxed α phases less than 1 μm was produced. Superplastic tensile experiments indicate that this ultra-fine grained Ti-17 powder compact exhibits superplasticity in all tested conditions and a maximum elongation-to-failure of 1353% is obtained at temperature of 830 °C and initial strain rate of 5 Ã 10â4 sâ1. During superplastic deformation of prepared Ti-17 powder compact, the coarsening of the microstructure is seriously influenced by the coalescence of dynamically recrystallized grains and the superplastic failure is caused by a combination of necking, cavity growth and cavity interlinkage. Almost all prepared Ti-17 powder compact specimens present better superplasticity than conventional cast and forged Ti-17 alloy even at high strain rate of 10â3 sâ1.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Z.L. Zhao, H.Z. Guo, T. Wang, Z.K. Yao,