The free-grained microstructure of TA15 titanium alloy was prepared through two-step forging technology combined with high and low temperatures, and a transnormal superplastic elongation of more than 2000% was obtained. The superplastic behaviour and microstructure evolution were systematically researched at different temperatures and strain rates through superplastic tensile test. The results indicate that the free-grained TA15 alloy exhibits superplasticity at temperatures of 760-980℃ and initial strain rates from 1.1 ×10-2 to 5.5× 10-5s-1.The optimal superplastic conditions are 940℃ and 3.3× 10-4 s-1, in which the average elongation is 2526% and the maximum elongation is 2743%. During superplastic deformation, dynamic recovery and recrystallization occur obviously, and the corporate effect of strain harden-ing and recrystallization softening decides the superplastic ability directly.
参考文献
| [1] | Wang G C;Liu Z H;Du Z Q .Study on superplastic optimal deformation pattern in Ti-15-3 titanium alloy[J].J Aeronaut Mater(in Chinese),1998,18(03):22. |
| [2] | Zou K C;Huang B Y;Qu X H;Chen X Q .Microstructural characterization of a superplastically deformed TiAl-based alloy[J].Rare Met Mater Eng(in Chinese),1998,27(06):336. |
| [3] | 沙爱学,李兴无,储俊鹏.TA15钛合金的普通退火[J].稀有金属,2003(01):213-215. |
| [4] | 曹京霞,方波,黄旭,李臻熙.微观组织对TA15钛合金力学性能的影响[J].稀有金属,2004(02):362-364. |
| [5] | LI Shikai,XIONG Baiqing,HUI Songxiao.Effects of cooling rate on the fracture properties of TA15 ELI alloy plates[J].稀有金属（英文版）,2007(01):33-38. |
| [6] | Semiation S L;Seetharaman V;Weiss I .The thermomechanical processing of alpha/beta titanium alloys[J].JOM-Journal of the Minerals Metals and Materials Society,1997,49(06):33. |
| [7] | Hirofumi Y;Jun N .Ultra-free-grain refinement and superplasticity of titanium alloys obtained through protium treatment[J].International Journal of Hydrogen Energy,2002,27:769. |
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