当前位置: X-MOL 学术Phase Transit. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
The role of quenched-in disorder in polycrystalline bulk and melt-spun ribbons of Ni50Mn29Ga21
Phase Transitions ( IF 1.6 ) Pub Date : 2021-05-17 , DOI: 10.1080/01411594.2021.1928125
A. Satish Kumar 1 , M. Ramudu 2 , V. Seshubai 3
Affiliation  

ABSTRACT

Investigations on the properties of polycrystalline bulk and melt-spun ribbons of composition Ni50Mn29Ga21 are contrasted. Both samples are subjected to quenching after melting and then were homogenized at the same temperature. Though the electron per atom ratio is unchanged, the quenched-in disorder has caused the structural and magnetic transformations to occur in close proximity in the ribbon giving rise to magnetic entropy change of –9.2 J/kg-K at the martensitic transformation. The bulk alloy showed significantly high magnetic field-induced strain of 0.7% at 5 kOe magnetic field and an apparent compressive strain of 5.3% at 40 MPa compression stress, without training the sample. Large grain size and micro-twinning are observed in the bulk, while nano-scale twinning is seen in the ribbon. The variations in the process altered the degree of ordering, which modified the transformation temperatures, the crystal structure, the microstructures of the ribbon and the mechanical properties of the bulk specimen significantly.



中文翻译:

淬火无序在 Ni50Mn29Ga21 多晶块体和熔纺薄带中的作用

摘要

成分为 Ni 50 Mn 29 Ga 21的多晶块状和熔纺薄带性能的研究是对比的。两种样品均在熔化后进行淬火,然后在相同温度下均质化。虽然每原子电子的比例没有变化,但淬火无序导致结构和磁转变在带中发生在靠近的地方,从而在马氏体转变时产生 –9.2 J/kg-K 的磁熵变化。块状合金在 5 kOe 磁场下显示出 0.7% 的显着高磁场诱导应变,在 40 MPa 压缩应力下显示出 5.3% 的表观压缩应变,无需对样品进行训练。在块体中观察到大晶粒尺寸和微孪晶,而在条带中观察到纳米级孪晶。过程中的变化改变了有序度,从而改变了转变温度、晶体结构、

更新日期:2021-06-04
down
wechat
bug