Hot deformation mechanisms in ELI grade Ti-6Al-4V

被引：129

作者：

Seshacharyulu, T ^{[1
]}

Medeiros, SC ^{[1
]}

Morgan, JT ^{[1
]}

Malas, JC ^{[1
]}

Frazier, WG ^{[1
]}

Prasad, YVRK ^{[1
]}

机构：

[1] USAF, Res Lab, Mat & Mfg Directorate, Mat Proc Design Branch, Wright Patterson AFB, OH 45433 USA

来源：

SCRIPTA MATERIALIA | 1999年 / 41卷 / 03期

关键词：

Ti-6Al-4V; hot working; microstructure; mechanisms;

D O I：

10.1016/S1359-6462(99)00163-3

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The processing map developed on Ti-6-4 with Widmanstatten starting microstructure revealed the material exhibits globularization in the α-β phase field while the β phase deforms by the mechanism of large-grained superplasticity. The apparent activation energy of hot deformation in the α-β range using kinetic analysis yielded a value of 453 kJ/mole, while a value of 165-240 kJ/mole is obtained using Schock and Kocks models. The latter value of activation energy together with an estimated activation volume of 13-85 b3 suggests that cross-slip is the rate controlling mechanism for globularization. The apparent activation energy for β large-grained superplasticity matches well with that of self-diffusion in β.

引用

页码：283 / 288

页数：6

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