TY - JOUR
T1 - Superplasticity in the Ti-6Al-7Nb alloy processed by high-pressure torsion
AU - Ashida, Maki
AU - Chen, Peng
AU - Doi, Hisashi
AU - Tsutsumi, Yusuke
AU - Hanawa, Takao
AU - Horita, Zenji
N1 - Funding Information:
This work was supported in part by the Light Metals Educational Foundation of Japan, in part by a Grant-in-Aid for Scientific Research from the MEXT, Japan, in Innovative Areas "Bulk Nanostructured Metals" (No. 22102004 ), and in part by a Grant-in-Aid for Scientific Research (S) from the MEXT , Japan (No. 26220909 ). The alloy was processed at the International Research Center on Giant Straining for Advanced Materials (IRC-GSAM) of Kyushu University.
PY - 2015/7/9
Y1 - 2015/7/9
N2 - The Ti-6Al-7Nb alloy is considered a promising material for biomedical applications as it is free of V, which is replaced with Nb for better biocompatibility. This Ti alloy was processed by high-pressure torsion (HPT) at room temperature to refine the grain size to ~100nm. The Vickers microhardness was increased from 325 HV at the initial as-annealed state to 385 HV after the HPT processing. The HPT-processed samples were deformed under tension at 1073K (~0.58Tm, Tm is the melting point) with an initial strain rate in the range of 10-4 to 10-2s-1. The HPT-processed sample through 5 revolutions exhibited an excellent superplastic elongation of 930% at an initial strain rate of 2×10-3s-1. To conclude, HPT processing is effective in achieving superplasticity of the Ti-6Al-7Nb alloy.
AB - The Ti-6Al-7Nb alloy is considered a promising material for biomedical applications as it is free of V, which is replaced with Nb for better biocompatibility. This Ti alloy was processed by high-pressure torsion (HPT) at room temperature to refine the grain size to ~100nm. The Vickers microhardness was increased from 325 HV at the initial as-annealed state to 385 HV after the HPT processing. The HPT-processed samples were deformed under tension at 1073K (~0.58Tm, Tm is the melting point) with an initial strain rate in the range of 10-4 to 10-2s-1. The HPT-processed sample through 5 revolutions exhibited an excellent superplastic elongation of 930% at an initial strain rate of 2×10-3s-1. To conclude, HPT processing is effective in achieving superplasticity of the Ti-6Al-7Nb alloy.
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U2 - 10.1016/j.msea.2015.06.020
DO - 10.1016/j.msea.2015.06.020
M3 - Article
AN - SCOPUS:84935899379
VL - 640
SP - 449
EP - 453
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -