用正电子寿命谱测量方法研究了5种不同化学成分的近等原子比NiTi合金中的微观缺陷和自由电子密度.结果表明,当Ni原子和Ti原子形成NiTi合金时部分3d电子被局域化而形成共价键,导致合金中参与形成金属键的自由电子减少.近等原子比的NiTi合金中的基体和缺陷处的自由电子浓度均随Ni含量的增加而改变,并且当Ni含量为51 at％时达到最大值.研究还发现Ni51Ti49合金含有最少的缺陷,从而有助于马氏体相变的发生,这可能成为Ni51Ti49合金具有最好的形状记忆效应的一个原因.
参考文献
| [1] | LIANG ChunYong,YANG Yang,WANG HongShui,YANG JianJun,YANG XianJin.Preparation of porous microstructures on NiTi alloy surface with femtosecond laser pulses[J].科学通报（英文版）,2008(05):700-705. |
| [2] | 胡益丰,沈大华,邓文.NiTi形状记忆合金中缺陷和电子密度的正电子湮没研究[J].稀有金属材料与工程,2009(01):38-41. |
| [3] | Gibkes J;Chirtoc M;Antoniow J S et al.[J].The European Physical Journal,2008,153:151. |
| [4] | Danilov A;Tuukkanen T;Tuukkanen J;Jamsa T .Biocompatilibity-related surface characteristics of oxidized NiTi.[J].Journal of biomedical materials research, Part A,2007(4):810-819. |
| [5] | Deng Wen;Chen Zhenying;Jiang Haifeng et al.[J].Science in China Series G:Physics Mechanics & Astronomy,2008,51(09):1221. |
| [6] | Deng Wen;Huang Yuyang;Brusa R S et al.[J].Journal of Alloys and Compounds,2005,386:103. |
| [7] | Erdelyi G;Beke D L;Bernardini J et al.[J].Physical Review B,2000,62(17):11,284. |
| [8] | Zheng Y F;Huang B M;Zhang J X et al.[J].Materials Science and Engineering A,2000,279:25. |
| [9] | Shabalovskaja S A;Lotkov A I .[J].Solid State Communications,1987,62:93. |
| [10] | West R N .[J].Advances in Physics,1973,22(03):263. |
| [11] | DENG Wen;HUANG Yu-yang;WU Dao-hong .Influence of chemical composition and alloying elements on microdefects and electron density in Ni-Al alloys[J].Transactions of Nonferrous Metals Society of China,2002(3):370-374. |
| [12] | Slotte J .Nuclear Instruments & Methods in Physics Research[J].B Beam Interactions with Materials and Atoms,2006,253(1-2):130. |
| [13] | Brandt W;Reinheimer J .[J].Physical Review B,1970,2(08):3104. |
| [14] | Komeda T.;Nishioka Y. .STM and cluster calculation study of segregated B on Si(001) surface[J].Japanese Journal of Applied Physics,1998(3B):1188-1192. |
| [15] | Jia Ti;Dong Zhizhong;Yu Shenjun et al.[J].Chinese Journal of Rare Metals,1998,22(02):103. |
| [16] | Chen Min;He Linzhu;Zhang Shuihe et al.[J].Journal of Lanzhou Universit,1994,30(03):59. |
| [17] | Stroz D;Chrobak D .[J].Materials Transactions,2011,52(03):358. |
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%