Thermal and acoustic noises generated by austenite/martensite transformation in NiFeGaCo single crystals

被引：21

作者：

Bolgar, M. K. ^{[1
]}

Toth, L. Z. ^{[1
]}

Szabo, S. ^{[1
,2
]}

Gyoengyoesi, Sz. ^{[1
]}

Daroczi, L. ^{[1
]}

Panchenko, E. Y. ^{[3
]}

Chumlyakov, Y. I. ^{[3
]}

Beke, D. L. ^{[1
]}

机构：

[1] Univ Debrecen, Dept Solid State Phys, H-4010 Debrecen, Hungary

[2] Coll Nyiregyhaza, Dept Phys & Prod Engn, Budapest, Hungary

[3] Tomsk State Univ, Siberian Phys Tech Inst, Tomsk 634050, Russia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 658卷

关键词：

Shape memory; NiFeGaCo; Martensitic transformations; Acoustic emission; MARTENSITIC-TRANSFORMATION; MAGNETIC-TRANSFORMATIONS; DISTRIBUTIONS; STRAIN;

D O I：

10.1016/j.jallcom.2015.10.173

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Jerky character of austenite/martensite transformation has been investigated in NiFeGaCo shape memory single crystalline samples simultaneously by Differential Scanning Calorimeter, DSC, and by Acoustic-Emission, AE. Statistical analysis of the noise signals resulted in the same energy exponents, epsilon, about 1.7 +/- 0.1 for heating, as well as 2.0 +/- 0.1 for cooling, from both acoustic emission and thermal signals at low cooling rates (dT/dt = 0.1 K/min). The exponents of peak amplitudes of AE signals are alpha = 2.5 +/- 0.1 and 2.9 +/- 0.1 for heating and cooling, respectively. The obtained exponents fulfill the scaling rule (alpha-1)/(epsilon-1) = z with z = 2. Optical observation of the transformation confirmed that it takes place by single interface motion, i.e. the jerky character is the result of the stop-and-go type motion of this interface. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：29 / 35

页数：7

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