Sintering regimes and resulting microstructure and properties of binder jet 3D printed Ni-Mn-Ga magnetic shape memory alloys
Sintering regimes and resulting microstructure and properties of binder jet 3D printed Ni-Mn-Ga magnetic shape memory alloys
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DOI：
10.1016/j.actamat.2018.05.047
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发表时间：
2018-08-01
期刊：
影响因子：
9.4
通讯作者：
Chmielus, Markus
中科院分区：
文献类型：
--
作者：
Mostafaei, Amir;De Vecchis, Pierangeli Rodriguez;Chmielus, Markus
采用粘结剂喷射3D打印技术，将烧结温度从1000℃提高到1100℃，烧结2小时，制备出密度从45%提高到99%的磁性形状记忆合金样品。在此温度范围内，研究了烧结机制、显微组织演变、相变和磁性行为，并对三种不同的烧结制度进行了分类。x射线衍射表明，预合金球磨Ni49.7Mn30Ga20.3粉末具有奥氏体相，但在整个烧结温度范围内均存在孪晶14m调制马氏体，孪晶马氏体的形成随温度升高而增加。在低温烧结状态下(
Binder jet 3D printing was used to produce magnetic shape memory alloy samples with densities increasing from 45% to 99% with increasing sintering temperature from 1000 degrees C to 1100 degrees C for 2 h. Within this temperature range, the sintering mechanisms, microstructural evolution, phase transformation and magnetic behavior were investigated and categorized in three different sintering regimes. X-ray diffraction showed that the pre-alloyed ball-milled Ni49.7Mn30Ga20.3 powder has the austenite phase, however, twinned 14 M modulated martensite is present over the entire sintering temperature range with an increasing formation of martensite twins with temperature. At the low temperature sintering regime (