研究了7050铝合金在温度为460℃,应变速率分别为1.0×10-4s-1和 0.1s-1条件下的高温拉伸变形过程.结果表明:7050铝合金在高温拉伸过程中平均晶界取向差角与真应变之间保持比例关系,晶粒尺寸随变形的进行而增加.晶粒的长径比在变形条件为460℃/1.0×10-4s-1变形时基本保持不变;而变形条件为460℃/0.1s-1时,晶粒长径比则随着变形的进行而增加.微观组织结果表明,7050铝合金在460℃/1.0×10-4s-1的变形过程中,软化机制为连续动态再结晶,而变形条件为460℃/0.1s-1时,软化机制为动态回复.连续动态再结晶过程中平均晶界取向差角的持续增加与亚晶界的迁移和变形过程中晶界吸入位错有关.
参考文献
| [1] | WILLIAMS J C;STARKE E A .Progress in structura materials for aerospace systems[J].Acta Materialia,2003,51:5775-5799. |
| [2] | WLOKA J;HACK T;VIRTANEN S .Influence of temper and surface condition on the exofoliation behaviour of high strength Al-Zn-Mg-Cu alloy[J].Corrision Science,2007,49:1437-1449. |
| [3] | 宋仁国.高强度铝合金的研究现状及发展趋势[J].材料导报,2000(01):20-21,34. |
| [4] | 任建平,宋仁国,陈小明,李杰.7xxx系铝合金热处理工艺的研究现状及进展[J].热加工工艺,2009(06):119-124. |
| [5] | Han BJ;Xu Z .Microstructural evolution of Fe-32%Ni alloy during large strain multi-axial forging[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1-2):119-124. |
| [6] | GOURDET S;MONTHEILLET F .An experimental study of the recrystallization mechanism during hot deformation of aluminium[J].Materials Science and Engineering A,2000,283:274-288. |
| [7] | LIU Q;HUANG XX;YAO M .On deformation-induced continuous recrystallization in a superplastic Al-Li-Cu-Mg-Zr alloy[J].Acta Metallurge Materialia,1992,40:1753-1762. |
| [8] | Y. Xun;M.J. Tan .EBSD characterization of 8090 Al-Li alloy during dynamic and static recrystallization[J].Materials Characterization,2004(3):187-193. |
| [9] | XUN Y;TAN M J;NIEH T G .Grain boundary characterization in superplastic deformation of Al-Li alloy using electron backscatter diffraction[J].Matererial Science and Technology,2004,20:173-180. |
| [10] | H. Lu;P. Sivaprasad;C.H.J. Davies .Treatment of misorientation data to determine the fraction of recrystallized grains in a partially recrystallized metal[J].Materials Characterization,2003(5):293-300. |
| [11] | M. Cabibbo;E. Evangelista;C. Scalabroni .EBSD FEG-SEM, TEM and XRD techniques applied to grain study of a commercially pure 1200 aluminum subjected to equal-channel angular-pressing[J].Micron: The international research and review journal for microscopy,2005(5):401-414. |
| [12] | Masayuki Kamaya;Angus J. Wilkinson;John M. Titchmarsh .Measurement of plastic strain of polycrystalline material by electron backscatter diffraction[J].Nuclear engineering and design,2005(6):713-725. |
| [13] | Jun-Hyun Han;Kwang-Koo Jee;Kyu Hwan Oh .Orientation rotation behavior during in situ tensile deformation of polycrystalline 1050 aluminum alloy[J].International Journal of Mechanical Sciences,2003(10):1613-1623. |
| [14] | S. Gourdet;F. Montheillet .A model of continuous dynamic recrystallization[J].Acta materialia,2003(9):2685-2699. |
| [15] | H.J. McQueen .Development of dynamic recrystallization theory[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(0):203-208. |
| [16] | TSUZAKI K;HUANG X X;MAKI T .Mechanism of dynamic continuous recrystallization during superplastic deformation in microduplex stainless steel[J].Acta Materialia,1996,44:4491-4499. |
| [17] | Hirata T.;Mukai T.;Saito N.;Tanabe S.;Kohzu M.;Higashi K. .Experimental prediction of deformation mechanism after continuous dynamic recrystallization in superplastic P/M7475[J].Journal of Materials Science,2003(19):3925-3932. |
| [18] | Taketo Sakuma;Kenji Higashi .Summary in the project " towards innovation in superplasticity"[J].Materials transactions,1999(8):702-715. |
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%