Positron annihilation spectroscopy study of Ni-Mn-Ga ferromagnetic shape memory alloys

被引：2

作者：

Merida, David ^{[1
]}

Angel Garcia, Jose ^{[1
]}

Apinaniz, Estibaliz ^{[2
]}

Plazaola, Fernando ^{[2
]}

Sanchez-Alarcos, Vicente ^{[3
]}

Ignacio Perez-Landazabal, Jose ^{[3
]}

Recarte, Vicente ^{[3
]}

机构：

[1] Euskal Herriko Unibertsitatea UPV EHU, Pk 644, Bilbao 48080, Spain

[2] Herriko Unibertsitatea UPV EHU, Elektrizitate Elektronika Saila, E-48080 Bilbao, Spain

[3] Univ Publ Navarra, Dept Fis, E-31006 Pamplona, Spain

来源：

POSITRON STUDIES OF DEFECTS 2011 | 2012年 / 35卷

关键词：

NiMnGa; positron annihiliation lifetime spectroscopy; martensitic transformation; vacancies; NI2MNGA; SYSTEM;

D O I：

10.1016/j.phpro.2012.06.011

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We have studied the role that vacancy type defects play in the martensitic transformation of Ni-Mn-Ga ferromagnetic shape memory alloys by means of positron lifetime spectroscopy. The measurements presented in this work have been performed in five ternary alloys. Three of them transform to modulated and two to non-modulated martensitic phases. With these five samples we cover a large range in composition. Positron experiments have been performed at room temperature after subsequent isochronal annealing at different temperatures and up to a maximum temperature of 600 degrees C. Results show a large variation of the average positron lifetime value with the isochronal annealing temperature in non-modulated samples. However, the response in the modulated samples is quite different. The results are discussed in term of different type of positron trapping defects and their evolution with the annealing temperature. The present work shows a correlation between vacancy concentration and martensitic transformation temperature of ferromagnetic shape memory alloys. (c) 2012 The Authors Published by Elsevier B.V. Selection and/or peer-review under responsibility of Organizing Committee.

引用

页码：57 / 62

页数：6

共 14 条

[1] Studies of light alloys by positron annihilation techniques
Dupasquier, A
Kögel, G
Somoza, A
[J]. ACTA MATERIALIA, 2004, 52 (16) : 4707 - 4726
[2] Self-diffusion in Ni2MnGa
Erdelyi, G.
Mehrer, H.
Imre, A. W.
Lograsso, T. A.
Schlagel, D. L.
[J]. INTERMETALLICS, 2007, 15 (08) : 1078 - 1083
[3] EVOLUTION OF THE POSITRON-ANNIHILATION LIFETIME FOR AGING IN BETA-PHASE CU-AL-NI-(TI)-(MN) SHAPE-MEMORY ALLOYS
HURTADO, I
SEGERS, D
VANHUMBEECK, J
DORIKENSVANPRAET, L
DAUWE, C
[J]. SCRIPTA METALLURGICA ET MATERIALIA, 1995, 33 (05): : 741 - 747
[4] Pinning-induced stabilization of martensite - Part II. Kinetic stabilization in Cu-Zn-Al alloy due to pinning of moving interfaces
Kustov, S
Pons, J
Cesari, E
Van Humbeeck, J
[J]. ACTA MATERIALIA, 2004, 52 (10) : 3083 - 3096
[5] Positron Annihilation Spectroscopy Study of NiMnGa Modulated and Non-Modulated Martensitic Phases
Merida, David
Angel Garcia, Jose
Apinaniz, Estibalitz
Plazaola, Fernando
Sanchez-Alarcos, Vicente
Ignacio Perez-Landazabal, Jose
Recarte, Vicente
[J]. FERROMAGNETIC SHAPE MEMORY ALLOYS II, 2010, 635 : 55 - +
[6] Study of defects and phase transformation in a Fe-Mn-Si-Cr-Ni alloy by positron annihilation method
Mostafa, Khaled M.
Van Caenegem, N.
De Baerdemaeker, J.
Segers, D.
Houbaert, Y.
[J]. PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 4, NO 10, 2007, 4 (10): : 3554 - +
[7] Promising ferromagnetic Ni-Co-Al shape memory alloy system
Oikawa, K
Wulff, L
Iijima, T
Gejima, F
Ohmori, T
Fujita, A
Fukamichi, K
Kainuma, R
Ishida, K
[J]. APPLIED PHYSICS LETTERS, 2001, 79 (20) : 3290 - 3292
[8] Magnetic and martensitic phase transitions in ferromagnetic Ni-Ga-Fe shape memory alloys
Oikawa, K
Ota, T
Ohmori, T
Tanaka, Y
Morito, H
Fujita, A
Kainuma, R
Fukamichi, K
Ishida, K
[J]. APPLIED PHYSICS LETTERS, 2002, 81 (27) : 5201 - 5203
[9] Positron lifetime calculation for the elements of the periodic table
Robles, J. M. Campillo
Ogando, E.
Plazaola, F.
[J]. JOURNAL OF PHYSICS-CONDENSED MATTER, 2007, 19 (17)
[10] Robles JMC, 2003, DEFECT DIFFUS FORUM, V213-2, P141

← 1 2 →