采用电子拉伸试验机考察了不同预变形量热-机械循环处理对FeMnSiCrNi合金形状记忆效应的影响,并利用光学及透射电子显微分析方法研究了经热-机械循环处理后母相γ及应力诱发ε马氏体的组织变化.结果表明：在预变形量为4%、5%、和6%的情况下,经2次循环训练后具有最高的应变恢复率;适当的热-机械循环处理能促进母相γ中形成大量按一定取向分布的晶体缺陷,为择优取向ε马氏体的成长打开通道,显著降低ε马氏体的几何尺寸,提高其逆相变的晶体学可逆性;若热-机械循环次数过多,母相γ中会形成位错缠结,阻碍γ→ε相变过程中层错扩展,从而不利于形状记忆效应.
The influence of thermal-mechanical cycling treatment on the shape memory effect in FeMnSiCrNi alloy was investigated using an electronic tensile tester,and the microstructural variation of parent phase γ and the stress induced ε martensite after thermal-mechanical cycling treatment were investigated by optical and transmission electronic microscopy.The results show that with pre-strain of 4%,5% and 6%,the FeMnSiCrNi samples exhibit the maximum recovery ratio when subjected two treatment cycles.A lot of crystal defects orientated on some directions are introduced to the parent phase γ through thermal-mechanical cycle treatment,which is helpful for the growth of stress induced ε martensite of preferential orientations.At the same time,the thermal-mechanical cycle treatment results in the significant decrease of the average size of stress induced ε martensite,which can improve the crystallographic reversibility of ε martensite during the reverse transformation process.However,excessive treatment cycles may lead to tangled dislocations,which can hinder the extension of fault defects during stress induced γ→ε transformation,and thus decrease the shape memory effect in the FeMnSiCrNi alloy.
参考文献
| [1] | 董允,林晓娉,丁坤英,李海鹏,梁春勇.Fe-Mn-Si形状记忆合金马氏体相变宏观形状应变特征[J].材料热处理学报,2007(06):27-32. |
| [2] | 胡锐,潘红雄,李金山,王新虎,赵新伟,傅恒志.Ni含量与预应变量对Fe基形状记忆合金形状记忆效应的影响[J].材料热处理学报,2006(04):11-14. |
| [3] | 李宁,文玉华,席华萍.不同淬火态Fe-Mn-Si-Cr-Ni形状记忆合金热机械循环训练效果的研究[J].功能材料,2000(06):601. |
| [4] | 乔志霞,刘永长,王江宏,孟毅,王东爱.预应变对Fe-Mn-Si记忆合金中应力诱发εM形态的影响[J].材料科学与工程学报,2008(01):46-48,52. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%