采用DSC和SEM等研究了采用不封装热等静压法(CF-HIP)在不同烧结时间下制备的多孔NiTi形状记忆合金时效时的马氏体相变行为.结果表明:经1 050℃烧结1 h后,合金中主要含有Ti2Ni相和大块的Ni3Ti相,随着烧结时间的延长,大块Ni3Ti相逐渐消失,Ti2Ni相几乎没有变化;将烧结试样经450℃时效后,随着时效时间的延长,Ni4Ti3相在母相中逐渐析出长大,短时烧结试样的马氏体相变过程分为三步(B2→R,R→B19′和B2→B19′),而长时烧结试样的则为两步(B2→R和R→B19′).
参考文献
| [1] | K. Otsuka;X. Ren .Physical metallurgy of Ti-Ni-based shape memory alloys[J].Progress in materials science,2005(5):511-678. |
| [2] | Bataillard L.;Gotthard R.;Bidaux JE. .Interaction between microstructure and multiple-step transformation in binary NiTi alloys using in-situ transmission electron microscopy observations[J].Philosophical Magazine.A.Physics of condensed matter, defects and mechanical properties,1998(2):327-344. |
| [3] | J. Khalil Allafi;X. Ren;G. Eggeler .The mechanism of multistage martensitic transformations in aged Ni-rich NiTi shape memory alloys[J].Acta materialia,2002(4):793-803. |
| [4] | K. Fujishima;M. Nishida;Y. Morizono;K. Yamaguchi;K. Ishiuchi;T. Yamamuro .Effect of heat treatment atmosphere on the multistage martensitic transformation in aged Ni-rich Ti-Ni alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):489-494. |
| [5] | M. C. Carroll;Ch. Somsen;G. Eggeler .Multiple-step martensitic transformations in Ni-rich NiTi shape memory alloys[J].Scripta materialia,2004(2):187-192. |
| [6] | Genlian Fan;Wei Chen;Sen Yang .Origin of abnormal multi-stage martensitic transformation behavior in aged Ni-rich Ti-Ni shape memory alloys[J].Acta materialia,2004(14):4351-4362. |
| [7] | 袁斌,梁锦霞,李星,曾美琴,高岩.工艺参数对热等静压法制备多孔 NiTi记忆合金孔隙特性的影响[J].机械工程材料,2008(03):8-12. |
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%