Microstructural evolution and magnetic properties of binder jet additive manufactured Ni-Mn-Ga magnetic shape memory alloy foam

被引：94
|
作者：
Mostafaei, Amir [1 ]
Kimes, Katerina A. [1 ]
Stevens, Erica L. [1 ]
Toman, Jakub [1 ]
Krimer, Yuval L. [1 ]
Ullakko, Kari [2 ]
Chmielus, Markus [1 ]
机构：
[1] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA
[2] Lappeenranta Univ Technol, Mat Phys Lab, Laitaatsillantie 3, Savonlinna 57170, Finland
来源：
ACTA MATERIALIA | 2017年 / 131卷
基金：
美国国家科学基金会;
关键词：
Additive manufacturing; Solid-state sintering; Porosity; Phase transformation; Magnetic shape memory; Ferromagnetic shape memory; FIELD-INDUCED STRAINS; PHASE-TRANSFORMATION; MECHANICAL PROPERTY; PRINTED SAMPLES; MARTENSITIC-TRANSFORMATION; CRYSTAL-STRUCTURE; TEMPERATURE; BEHAVIOR; DENSIFICATION; DEPENDENCE;
D O I：
10.1016/j.actamat.2017.04.010
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study investigated microstructural evolution, phase transformation and magnetic behavior of additively manufactured magnetic shape memory alloy foam. Pre-alloyed angular Ni-Mn-Ga ball-milled powder was binder jet printed and sintered at 1020 degrees C for 4 h in both vacuum and argon atmospheres. Porosity of the manufactured foams was studied using micro-computed x-ray tomography and it was found that the relative density of the sintered parts was about 50-60%. In the printed sample that was sintered in argon, electron microscopy with elemental analysis showed no compositional gradient. X-ray diffraction indicated that IOM modulated martensite was present in the pre-alloyed powder as well as the sample sintered in argon. Differential scanning calorimetry and thermomagnetic results showed that martensitic transformation of the sample sintered in argon was at 34 degrees C, while barely detectable in the sample sintered in vacuum. Saturation magnetization of the printed sample sintered in argon atmosphere was around 68.4 Am-2/kg. Production of a magnetic shape memory alloy by printing would enable complex-shaped elements for demanding applications, and intentionally including porosity could allow these polycrystals to exhibit the magnetic shape memory effect. Therefore, a facile method for sintering of Ni Mn Ga printed parts has been presented for the first time. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：482 / 490
页数：9
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