Influence of annealing and phase decomposition on the magnetostructural transitions in Ni50Mn39Sn11
Influence of annealing and phase decomposition on the magnetostructural transitions in Ni50Mn39Sn11
复制标题
退火和相分解对Ni50Mn39Sn11磁结构转变的影响
DOI：
10.1063/1.3067855
复制
发表时间：
2009
影响因子：
3.2
通讯作者：
T. Lograsso
中科院分区：
文献类型：
--
作者：
W. Yuhasz;D. Schlagel;Q. Xing;K. Dennis;R. McCallum;T. Lograsso
Ni 50 Mn 50 −xSnx（x=10-25）铁磁形状记忆合金的磁性和结构转变是当前的研究热点。与Ni-Mn-Ga一样，这些合金具有高温奥氏体和低温马氏体相，其中磁性状态强烈依赖于成分。为了研究化学有序化在微调其磁结构性质中的作用，它们首先在1223 K下退火4周以实现结构和成分均匀性，然后在773 K下进一步退火1周（低于报道的B2到L21转变的150 K）以增加化学有序化程度。 对于x=11，这种退火导致磁有序温度的急剧变化。在1223 K退火后，样品在140 K呈现出铁磁有序性.在773 K退火后，铁磁转变在350 K，这是铁磁奥氏体相的特征，具有15
Magnetic and structural transitions in the Ni50Mn50−xSnx (x=10–25) ferromagnetic shape memory alloys are currently of interest. As in Ni–Mn–Ga, these alloys feature high-temperature austenite and low-temperature martensite phases, where the magnetic state is strongly composition dependent. To study the role of chemical ordering in fine-tuning their magnetostructural properties, they were first annealed for 4 weeks/1223 K to achieve structural and compositional homogeneity, and were then further annealed for 1 week (∼150 K below the reported B2 to L21 transition) at 773 K to increase the degree of chemical ordering. For x=11, this anneal resulted in a dramatic change in the magnetic ordering temperature. Following the 1223 K anneal, the sample exhibited ferromagnetic ordering at 140 K. After the 773 K anneal, the ferromagnetic transition is at 350 K, a characteristic of the ferromagnetic austenite phase with 15