在应变速率为0.001～1 270 s-1、温度为298～1 023 K条件下对魏氏组织和双态组织的TC21钛合金进行拉伸试验,利用SEM对拉伸试样的断口进行观察.结果表明:TC21钛合金的拉伸力学行为存在显著的温度和应变速率相关性;当应变速率为0.001和0.05 s-1的屈服应力-温度曲线存在转折点,且转折点温度随应变速率的增大而升高;当温度低于转折点温度时,相同氧含量的TC21钛合金和多晶纯钛的屈服应力具有相似的温度相关性;微观组织影响屈服应力的幅值和拉伸塑性的大小,但不影响屈服应力的温度相关性和应变速率相关性;除魏氏组织在室温0.001 s-1时为穿晶和沿晶混合断裂外,其他工况下的魏氏组织和双态组织均为穿晶韧性断裂;TC21钛合金在拉伸变形过程中未出现绝热剪切带和形变孪晶.
参考文献
| [1] | MEESTER B;DONER M;CONRAD H .Deformation kinetics of the Ti-6Al-4V alloy at low temperatures[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1975,6:65-75. |
| [2] | Majorell A.;Srivatsa S.;Picu RC. .Mechanical behavior of Ti-6Al-4V at high and moderate temperatures - Part I: Experimental results[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(2):297-305. |
| [3] | MEYERS M A;SUBHASH G;KAD B K .Evolution of microstructure and shear-band formation in α-hcp titanium[J].Mechanics of Materials,1994,17:175-193. |
| [4] | Sia Nemat-Nasser;Wei-Guo Guo;Vitali F. Nesterenko .Dynamic response of conventional and hot isostatically pressed Ti--6Al--4V alloys : experiments and modeling[J].Mechanics of materials,2001(8):425-439. |
| [5] | Lee WS.;Lin CF. .Plastic deformation and fracture behaviour of Ti-6Al-4V alloy loaded with high strain rate under various temperatures[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):48-59. |
| [6] | FOLLANSBEE P S;GRAY G T .An analysis of the low temperature,low and high strain-rate deformation of TI-6Al-4V[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1989,20:863-874. |
| [7] | 赵永庆,曲恒磊,冯亮,杨海瑛,李辉,张颖楠,郭红超,黄定坤.高强高韧损伤容限型钛合金TC21研制[J].钛工业进展,2004(01):22-24. |
| [8] | 张颖楠,赵永庆,曲恒磊,李辉,冯亮,郭红超,黄定坤.热处理对TC21合金显微组织和室温拉伸性能的影响[J].稀有金属,2004(01):34-38. |
| [9] | 朱知寿,王新南,童路,刘东升.新型TC21钛合金热处理工艺参数与显微组织演变的关系研究[J].钛工业进展,2006(06):24-27. |
| [10] | Fei, YH;Zhou, L;Qu, HL;Zhao, YQ;Huang, CZ .The phase and microstructure of TC21 alloy[J].Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing,2008(1/2):166-172. |
| [11] | YU Hai-jun;YAO Guang-chun;WANG Xiao-lin;LI Bing;YIN Yao;LIU Ke .Sound insulation property of Al-Si closed-cell aluminum foam bare board material[J].Transactions of Nonferrous Metals Society of China,2007(1):93-98. |
| [12] | 冯亮,曲恒磊,赵永庆,李辉,张颖楠,曾卫东.TC21合金的高温变形行为[J].航空材料学报,2004(04):11-13. |
| [13] | 曲恒磊,赵永庆,冯亮,奚正平,李辉,夏源明.TC21钛合金不同变形条件下的显微组织研究[J].材料工程,2006(z1):274-277. |
| [14] | Yulong Li;Yazhou Guo;Haitao Hu;Q. Wei .A Critical Assessment Of High-temperature Dynamic Mechanical Testing Of Metals[J].International journal of impact engineering,2009(2):177-184. |
| [15] | Yuanming Xia;Yang Wang .Dynamic Testing of Materials with the Rotating Disk Indirect Bar-Bar Tensile Impact Apparatus[J].Journal of Testing and Evaluation: A Multidisciplinary Forum for Applied Sciences and Engineering,2007(1):31-35. |
| [16] | Huang W;Zan X;Nie X;Gong M;Wang Y;Xia YM .Experimental study on the dynamic tensile behavior of a poly-crystal pure titanium at elevated temperatures[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1/2):33-41. |
| [17] | PATON N E;WILLIAMS J C;RAUSCHER G P.Titanium science and technology[M].New York:Plenum Press,1973:1049-1069. |
| [18] | Lutjering G. .Influence of processing on microstructure and mechanical properties of (alpha+beta) titanium alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):32-45. |
| [19] | MAKEL D D;EYLON D .The effect of microstructure on localized melting at separation in Ti-6Al-4V tensile samples[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1990,21:3127-3136. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%