In:
Defect and Diffusion Forum, Trans Tech Publications, Ltd., Vol. 385 ( 2018-7), p. 189-194
Abstract:
Ti-6Al-4V alloy sheet with two kinds of initial microstructure (base material (BM) and heat-treated material) was subjected to friction stir processing (FSP). These two kinds of friction stir processed (FSPed) materials show similar characteristics that the microstructure exhibited equiaxed ultrafine-grained (UFG) structure with high fraction of high angle grain boundaries (HAGBs) and random crystallographic orientations. Furthermore, slightly finer grains were observed in FSPed heat-treated material than that in FSPed BM. Superplastic tensile tests were conducted utilizing the FSPed heat-treated material in the strain rates range from 1×10 -2 to 1×10 -4 s -1 at 650°C, and the optimal superplasciticy with an elongation of 1220% was achieved at 1×10 - 3 s - 1 . The superplastic deformation mechanism appears to be grain boundary sliding.
Type of Medium:
Online Resource
ISSN:
1662-9507
DOI:
10.4028/www.scientific.net/DDF.385
DOI:
10.4028/www.scientific.net/DDF.385.189
Language:
Unknown
Publisher:
Trans Tech Publications, Ltd.
Publication Date:
2018
detail.hit.zdb_id:
2051135-8