Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles

被引：15

作者：

Fichtner, Tina ^{[1
]}

Wang, Changhai ^{[1
]}

Levin, Aleksandr A. ^{[1
]}

Kreiner, Guido ^{[1
]}

Mejia, Catalina Salazar ^{[1
]}

Fabbrici, Simone ^{[2
,3
]}

Albertini, Franca ^{[2
]}

Felser, Claudia ^{[1
]}

机构：

[1] Max Planck Inst Chem Phys Solids MPI CPFS, DE-01187 Dresden, Germany

[2] Natl Res Council IMEM CNR, Inst Mat Elect & Magnetism, I-43124 Parma, Italy

[3] Lab Micro & Submicro Enabling Technol Emilia Roma, I-40129 Bologna, Italy

来源：

METALS | 2015年 / 5卷 / 02期

关键词：

PHASE-TRANSFORMATION; SINGLE-CRYSTALS; GA; TEMPERATURE; MICROSTRUCTURE; SN; TRANSITIONS; AL;

D O I：

10.3390/met5020484

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the effects of annealing on the martensitic phase transformation in the Ni-based Heusler system: Mn50Ni40Sn10 and Mn50Ni41Sn9 powder and Co50Ni21Ga32 nanoparticles. For the powdered Mn50Ni40Sn10 and Mn50Ni41Sn9 alloys, structural and magnetic measurements reveal that post-annealing decreases the martensitic transformation temperatures and increases the transition hysteresis. This might be associated with a release of stress in the Mn50Ni40Sn10 and Mn50Ni41Sn9 alloys during the annealing process. However, in the case of Co50Ni21Ga32 nanoparticles, a reverse phenomenon is observed. X-ray diffraction analysis results reveal that the as-prepared Co50Ni21Ga32 nanoparticles do not show a martensitic phase at room temperature. Post-annealing followed by ice quenching, however, is found to trigger the formation of the martensitic phase. The presence of the martensitic transition is attributed to annealing-induced particle growth and the stress introduced during quenching.

引用

页码：484 / 503

页数：20

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