Cyclic deformation behavior and fatigue lives of ultrafine-grained Ti-6AL-4V ELI alloy for medical use

被引：73
|
作者：
Saitova, L. R. [1 ]
Hoeppel, H. W. [1 ]
Goeken, M. [1 ]
Semenova, I. P. [2 ]
Valiev, R. Z. [2 ]
机构：
[1] Univ Erlangen Nurnberg, Dept Mat Sci & Engn, Inst Gen Mat Properties 1, D-91058 Erlangen, Germany
[2] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2009年 / 31卷 / 02期
关键词：
Ti-6Al-4V; Ultrafine-grained material; Fatigue strength; S-N curves; Damage; MECHANICAL-PROPERTIES; PURE TI; STRENGTH; METALS; ECAP;
D O I：
10.1016/j.ijfatigue.2008.08.007
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
It was shown that introducing an ultrafine-grained (UFG) microstructure in pure metals as well as some alloys leads to strongly enhanced fatigue properties. The cyclic deformation behavior of UFG Ti-6Al-4V ELI (extra low interstitials) alloy is studied by both strain and stress controlled fatigue tests using plastic strain amplitudes between 3 x 10(-4) and 5 x 10(-3) and stress amplitudes ranging from 550 to 670 MPa. The UFG microstructures were obtained by equal channel angular pressing (ECAP) with different number of passes followed by a subsequent thermomechanical treatment (TMT). When compared to the conventional grain (CG) size counterpart, the UFG alloy exhibited a pronounced enhancement in the fatigue life in the S-N (Wohler) diagram. It was also shown that additional UFG processing prior to TMT did not result in any further improvement of the fatigue resistance. Furthermore, microstructural investigations revealed a high cyclic stability of the UFG microstructure. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：322 / 331
页数：10
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