在700℃-850℃的温度范围内对Ti-6%Al-4%V(质量分数)合金板材进行超塑性拉伸试验,研究了应变速率为3×10-4-5×10-38-1条件下的拉伸变形行为.结果表明:Ti6A14V合金在空气中表现出良好的低温超塑性变形能力.在800℃初始应变速率ε=5×10-4s-1条件下,延伸率达到536%.在较低的700℃下变形(ε=5×10-4s-1),延伸率仍然超过了300%.在整个变形温度区间内,应变速率敏感性指数m均为0.3左右,最大值为0.63.在850℃变形激活能与晶界自扩散激活能十分相近,表明晶界扩散控制的晶界滑动是超塑性变形的主要机制.在700-750℃,变形激活能远大于晶界自扩散激活能,位错运动是激活能升高的原因.在800℃变形的激活能介于两者之间,表明随着温度的降低变形机制逐渐发生改变.
参考文献
| [1] | C.Leyens,M.Peters,Titanium and Titanium Alloys (Weinheim,Germany,Wiley-VCH Verlag GmbH & Co.KGaA,2003) p.1 |
| [2] | DING Hua,ZHANG Kaifeng,Current status and developments in superplastic studies of materials,The Chinese Journal of Nonferrous Metals,14(7),1059(2004)(丁桦,张凯锋,材料超塑性研究的现状与发展,中国有色金属学报,14(7),1059(2004)) |
| [3] | J.S.Kim,J.H.Kim,Y.T.Lee,C.G.Park,C.S.Lee,Microstructural analysis on boundary sliding and its accommodation mode during superplastic deformation of Ti6AI-4V alloy,Mater.Sci.Eng.,A263,272(1999) |
| [4] | ZENG Liying,ZHAO Yongqing,LI Qian,Study progress in low temperature superplasticity of titanium alloy,Material & Heat Treatment,35(22),61(2006)(曾立英,赵永庆,李倩,钛合金低温超塑性的研究进展,材料热处理,35(22),61(2006)) |
| [5] | D.B.Shan,Y.Y.Zong,T.F.Lu,Y.Lv,Microstructural evolution and formation mechanism of FCC titanium hydride in Ti-6AI-4V-xH alloys,Journal of Alloys and Compounds,427,229(2007) |
| [6] | G.A.Salishchev,R.M.Galiyev,O.R.Valiakhmetov,R.V.Safullin,R.Y.Lutfullin,O.N.Senkov,F.H.Froes,O.A.Kaibyshev,Development of Ti-6AI-4V sheet with low temperature superplastic properties,Journal of Material Processing Technology,116(2-3),265(2001) |
| [7] | FANG Xiaoqiang,LI Miaoquan,LIN Yingying,Formation of ultra-fine grained titanium alloy by equal channel angular pressing,Materials Review,20(10),107(2006)(方晓强,李淼朱,林莺莺,应用等通道转角挤压技术制备超细晶钛合金,材料导报,20(10),107(2006)) |
| [8] | V.N.Perevezentsev,V.N.Chuvildeev,S.A.Larin,Deformation micromechanisims and superplastic flow rheology in a wide strain rate range,Superplasticity in Advanced Materials,(5),613(1994) |
| [9] | ZHANG Junhong,HUANG Boyun,HE Yuehui,MENG Liping,Mechanical behaviors of TiAl alloy during low temperature superplastic deformation,Chinese Journal of Nonferrous Metal,13(2),442(2003)(张俊红,黄伯云,贺跃辉,孟力平,TiAl基合金低温超塑性变形的力学行为,中国有色金属学报,13(2),442(2003)) |
| [10] | E.Sato,K.Kuribayashi,Superplasticity and deformation induced grain growth,ISIJ International,33,825(1993) |
| [11] | M.Zelin,Grain growth during superplastic deformation,Interface Science,10,37(2002) |
| [12] | M.T.Cope,N.Ridley,Superplastic deformation characteristics of microduplex Ti-6Al-4V alloy,Material Science and Technology,2,140(1986) |
| [13] | M.L.Meiler,D.R.Lesuer,A.K.Mukherjee,α grain size and β volume fraction aspects of the superplasticity of Ti-6Al-4V,Material Science Engineering,A136,71(1991) |
| [14] | G.C.Morgan,C.Hammond,Superplastic deformation properties of β-Ti alloys,Material Science Engineering,86,159(1987) |
| [15] | W.A.Bryant,Correlation of data on the hot deformation of Ti-6Al-4V,Journal of Material Science,10,1793 (1975) |
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%