Low–cycle Fatigue Behavior and Deformation Substructure of Ti–2Al–2.5Zr Alloy at 673K

Chin J Mater Res

2010, Vol. 24

Issue (2): 165-168 DOI:

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Low–cycle Fatigue Behavior and Deformation Substructure of Ti–2Al–2.5Zr Alloy at 673K

WANG Hang¹; XU Yanling¹; SUN Qiaoyan¹; XIAO Lin¹; SUN Jun¹; GE Peng²

1.State Key Laboratory for Mechanical behavior of Materials; Xi'an Jiaotong University; Xi'an 710049
2.Northwest Institute for Nonferrous Metal Research; Xi'an 710016

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WANG Hang XU Yanling SUN Qiaoyan XIAO Lin SUN Jun GE Peng. Low–cycle Fatigue Behavior and Deformation Substructure of Ti–2Al–2.5Zr Alloy at 673K. Chin J Mater Res, 2010, 24(2): 165-168.

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Abstract

Low–cycle fatigue (LCF) tests of Ti–2Al–2.5Zr samples were performed at 673 K. The cyclic stress response curves show that an initial cyclic hardening followed by cyclic softening was displayed, subsequently second hardening appeared. Furthermore, this alloy displays much higher LCF life at 673 K than that at RT when cyclic strain amplitude (Δεt/2) exceeds 1.0%. Transmission electron microscopy (TEM) observations revealed that the typical dislocation structures were dislocation wall and cell. The improvement in LCF life of Ti–2Al–2.5Zr can be attributed to homogeneity of plastic deformation due to activation of multiple slips.

Key words: metallic materials low cycle fatigue Ti–2Al–2.5Zr secondary cyclic hardening dislocation

Received: 15 December 2009

Fund:

Supported by National Natural Science Foundation of China Nos.50671077 and 50831004, National Basic
Research Program of China Nos.2007CB613804 and 2010CB63100

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2010/V24/I2/165

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