研究了190℃时效12h后的2024合金在77～ 150K温度范围内蠕变行为.结果表明,2024合金低温下存在蠕变现象,并且所有温度下蠕变第Ⅰ阶段的蠕变应变量与蠕变时间均满足对数规律.100K和150K时蠕变曲线的第Ⅰ阶段持续500h以上,77K时试样经过1000h后仍未出现蠕变的稳态阶段.利用透射电镜观察了合金低温蠕变前后的位错组态,表明在定载条件下,随温度的升高蠕变后试样的位错密度上升,位错交互作用增强.在温度为150K时,看到位错的长程滑移,表明极低温度下2024合金的蠕变机制为位错机制.
参考文献
| [1] | 冯克嘉.日地空间物理[M].北京:北京师范大学出版社,1987 |
| [2] | 黄本诚.空间环境工程学[M].北京:宇航出版社,1993 |
| [3] | SOHN KS .Deformation and fracture behavior of an 8009 Al-Li alloy at cryogenic temperature[J].Scripta Metallurgicaet Materialis,1995,32(08):1255. |
| [4] | KEN YAMAMURA .Temperature dependence of mechanical properties at cryogenic temperature in Al-Li-Mg alloys[J].Light Metals,1991,41(08):515. |
| [5] | 陈鼎,陈振华.铝合金在低温下的力学性能[J].宇航材料工艺,2000(04):1-7. |
| [6] | KEISUKE I;HIROSHI O;YASUO K .Creep of pure Aluminiun materials at a low temperature[J].Journal of Materials Science Letters,1998,17:423-424. |
| [7] | McDONALD L C;HARTWING K T .Creep of Aluminium at Cryogenic Temperature[J].Advances in Cryogenic Engineering,1989,36(B):1135-1139. |
| [8] | B.W. Chua;L. Lu;M.O. Lai .Creep behavior of nanostructured Mg alloy at ambient and low temperature[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,2006(11):2102-2110. |
| [9] | REED R P;SIMONN J;WALSH P.Creep of eopper:4 to 295K[J].International Cryogenic Materials Conference,1989(07):1-13. |
| [10] | Henderson PJ.;Sandstrom R. .Low temperature creep ductility of OFHC copper[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):143-150. |
| [11] | 马秋林,张莉,徐宏,王志文.工业纯钛TA2室温蠕变第1阶段特性研究[J].稀有金属材料与工程,2007(01):11-14. |
| [12] | 聂德福,赵杰,张俊善.一种估算结构钢室温蠕变的方法[J].金属学报,2011(02):179-184. |
| [13] | CHU H P .Low Temperature Creep of a Titanium Alloy Ti6Al-2Cb-1Ta-0.8Mo[R].NASA.Technical Memorandom,1997. |
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%