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Impact of annealing on the martensitic transformation and magnetocaloric properties in all-3d-metal Mn50Ni32Co8Ti10 alloy ribbons
Intermetallics ( IF 4.4 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.intermet.2020.106882
Yuxi Zhang , Hai Zeng , Guang Yu , Kai Liu , Shengcan Ma , Kai Yang , Xuanwei Zhao , Gabrielle Yuan , Xiaohua Luo , Changcai Chen , Zhenchen Zhong

Abstract The effects of annealing at different temperatures (1053, 1103, 1153 K) on the martensitic transformation (MT) and magnetocaloric effect have been investigated in all-3d-metal Mn50Ni32Co8Ti10 alloy ribbons. In melt-spun ribbons, a coexistence of predominant 5-layer modulated martensite (5 M, monoclinic, space group P2/m) and a small amount of B2-type austenite with a cubic structure is revealed at room temperature (RT), demonstrating that the forward MT temperature ( T t FC ) lies just above the RT. After annealing, the coexistence of three different phases, the non-modulated L10 martensite (NM, tetragonal, space group P4/mmm), 5 M martensite, and B2 austenite, and the enhanced intensity of both B2 (400) and L10 (220) characteristic peaks exhibited in X-ray diffraction patterns are suggestive of the fact that T t FC is reducing. The ( T t FC ) -reduction induced by heat treatment is also confirmed by thermomagnetic measurements. T O D C : T t Z F C i n t h i s s e n t e n c e s h o u l d b e a l s o d e l e t e d The magnetic entropy change maximum also decreases after annealing because the MT slows down. However, it is worth noting that after annealing the effective refrigeration capacity increases more than twice of the melt-spun sample. The origin of ( T t FC ) -reduction induced by annealing is discussed.

中文翻译:

退火对全3d金属Mn50Ni32Co8Ti10合金薄带马氏体相变和磁热性能的影响

摘要 研究了不同温度(1053、1103、1153 K)退火对全3d金属Mn50Ni32Co8Ti10合金薄带马氏体转变(MT)和磁热效应的影响。在熔纺带中,室温 (RT) 下显示主要的 5 层调制马氏体(5 M,单斜晶系,空间群 P2/m)和少量具有立方结构的 B2 型奥氏体共存,表明MT 前向温度 (T t FC ) 位于 RT 正上方。退火后,三种不同相共存,即未调制的 L10 马氏体(NM、四方、空间群 P4/mmm)、5 M 马氏体和 B2 奥氏体,以及 B2 (400) 和 L10 (220) 的增强强度) X 射线衍射图中显示的特征峰表明 T t FC 正在减少。由热处理引起的 (T t FC ) 还原也通过热磁测量得到证实。TODC : T t ZFC in thissentenceshouldb ealsodeleted 由于MT变慢,磁熵变最大值在退火后也减小。然而,值得注意的是,退火后的有效制冷能力增加了熔纺样品的两倍以上。讨论了由退火引起的(T t FC ) -还原的起源。值得注意的是,退火后的有效制冷能力增加了熔纺样品的两倍以上。讨论了由退火引起的(T t FC ) -还原的起源。值得注意的是,退火后的有效制冷能力增加了熔纺样品的两倍以上。讨论了由退火引起的(T t FC ) -还原的起源。
更新日期:2020-10-01
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