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Acta Metall Sin  2011, Vol. 47 Issue (4): 462-468    DOI: 10.3724/SP.J.1037.2010.00534
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FLOW SOFTENING MECHANSIM OF A Ti ALLOY WITH LAMELLAR STRUCTURE DURING SUBTRANSUS DEFORMATION
SONG Hongwu1), ZHANG Shihong1), CHENG Ming1), LI Zhenxi2), CAO Chunxiao2), BAO Chunling3)
1) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2) Beijing Institute of Aeronautical Materials, Beijing 100095
3) Titanium Alloy Division, Shenyang Research Institute of Foundry, Shenyang 110023
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SONG Hongwu ZHANG Shihong CHENG Ming LI Zhenxi CAO Chunxiao. FLOW SOFTENING MECHANSIM OF A Ti ALLOY WITH LAMELLAR STRUCTURE DURING SUBTRANSUS DEFORMATION. Acta Metall Sin, 2011, 47(4): 462-468.

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Abstract  The flow stress has a considerable flow softening after a peak strain hardening at very low strains for Ti alloys with lamellar structure during subtransus deformation. In order to study the mechanism of such flow softening behavior, the deformation behavior of TC11 Ti alloy with a lamellar structure was studied using isothermal hot compression tests under a temperature range of 890-995 ℃ and a strain rate range of 0.01-10 s-1. Theoretical calculation shows the Hall-Petch strengthening effects induced by α/β  interface as well as the twin boundary in $\alpha$ lamellar are far more significant than that of the colony boundary. The flow softening can be related to reduction of Hall-Petch strengthening effects due to transfer from the hard slip mode to the soft one.
Key words:  TC11 Ti alloy      subtransus deformation      flow softening      Hall-Petch effect     
Received:  11 October 2010     
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Supported by National Basic Research Program of China (No.51319)
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SONG Hong-Wu
ZHANG Shi-Hong
CHENG Meng
LI Zhen-Xi
CAO Chun-Xiao
FU Chun-Ling

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00534     OR     https://www.ams.org.cn/EN/Y2011/V47/I4/462

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