Twin microstructure dependent mechanical response in Ni-Mn-Ga single crystals

被引：100

作者：

Straka, Ladislav ^{[1
,2
]}

Lanska, Natalyia ^{[1
]}

Ullakko, Kari ^{[1
]}

Sozinov, Alexei ^{[1
]}

机构：

[1] AdaptaMat Ltd, FIN-00390 Helsinki, Finland

[2] Aalto Univ, Lab Engn Mat, FIN-00076 Aalto, Finland

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 13期

关键词：

bending; gallium alloys; manganese alloys; martensitic structure; nickel alloys; twin boundaries; twinning; SHAPE-MEMORY MATERIALS; FIELD-INDUCED STRAINS; NI2MNGA; MOTION;

D O I：

10.1063/1.3373608

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Ni-Mn-Ga single crystals with a twinning stress of about 0.1 MPa were studied. They showed a tendency to stay in a single variant state and to retain only one or very few twin boundaries during martensite reorientation induced by an external stress or magnetic field. This makes the crystals problematic for application in a magnetic actuator. To solve the issue, we introduced many parallel twin boundaries into the crystals by bending. However, this twin microstructure was not stable under cycling load. Additionally, it exhibited a twinning stress of 0.8 MPa-about ten times higher than a crystal with a single boundary.

引用

页数：3

共 12 条

[1]

BASINSKI ZS, 1954, ACTA METALL MATER, V2, P101

[2]

Chopra HD, 1996, ACTA MATER, V44, P747, DOI 10.1016/1359-6454(95)00183-2

[3] Temperature dependence and temperature limits of magnetic shape memory effect [J].

Heczko, O ;

Straka, L .

JOURNAL OF APPLIED PHYSICS, 2003, 94 (11) :7139-7143

[4] Large field-induced strains in ferromagnetic shape memory materials [J].

James, RD ;

Tickle, R ;

Wuttig, M .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1999, 273 :320-325

[5] Influence of external stress on the reversibility of magnetic-field-controlled shape memory effect in Ni-Mn-Ga. [J].

Likhachev, AA ;

Sozinov, A ;

Ullakko, K .

SMART STRUCTURES AND MATERIALS 2001: ACTIVE MATERIALS: BEHAVIOR AND MECHANICS, 2001, 4333 :197-206

[6] Magnetic-field-controlled twin boundaries motion and giant magneto-mechanical effects in Ni-Mn-Ga shape memory alloy [J].

Likhachev, AA ;

Ullakko, K .

PHYSICS LETTERS A, 2000, 275 (1-2) :142-151

[7] 6% magnetic-field-induced strain by twin-boundary motion in ferromagnetic Ni-Mn-Ga [J].

Murray, SJ ;

Marioni, M ;

Allen, SM ;

O'Handley, RC ;

Lograsso, TA .

APPLIED PHYSICS LETTERS, 2000, 77 (06) :886-888

[8] Phenomenology of giant magnetic-field-induced strain in ferromagnetic shape-memory materials (invited) [J].

O'Handley, RC ;

Murray, SJ ;

Marioni, M ;

Nembach, H ;

Allen, SM .

JOURNAL OF APPLIED PHYSICS, 2000, 87 (09) :4712-4717

[9] A dislocation model for the magnetic field induced shape memory effect in Ni2MnGa [J].

Rajasekhara, S ;

Ferreira, PJ .

SCRIPTA MATERIALIA, 2005, 53 (07) :817-822

[10] Crystal quality boosts responsiveness of magnetic shape memory single crystals [J].

Rolfs, K. ;

Mecklenburg, A. ;

Guldbakke, J. -M. ;

Wimpory, R. C. ;

Raatz, A. ;

Hesselbach, J. ;

Schneider, R. .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2009, 321 (08) :1063-1067

← 1 2 →