Control of microstructure using magnetic fields and study of the mechanical behavior of Ni-rich Ni-Mn-Ga alloys
Control of microstructure using magnetic fields and study of the mechanical behavior of Ni-rich Ni-Mn-Ga alloys
复制标题
富镍Ni-Mn-Ga合金的磁场控制和力学行为研究
DOI：
10.1016/j.actamat.2020.08.055
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发表时间：
2020-10
期刊：
影响因子：
9.4
通讯作者：
Xi Li
中科院分区：
文献类型：
--
作者：
Long Hou;Yanchao Dai;Yves Fautrelle;Zongbin Li;Zhongming Ren;Xi Li
In the present work, the influence of an axial magnetic field on the structure of directionally solidified Ni-Mn-Ga alloys is investigated experimentally. It has been found that a radial graded distribution of the gamma (γ) phase and grain fragmentation of the martensite/γ phase can occur under a magnetic field. Indeed, the structures, including a single martensite zone and martensite/γ phase cellular and eutectic mixed zones, are seen under a weak magnetic field (B≤ 2 T). Under a strong magnetic field (B≥ 4 T), the grain fragmentation of the martensite/γ phase occurs. Moreover, the application of a strong magnetic field induces a structural distortion in the martensite and dislocation rearrangement inside the γ phase. On the basis of the above investigation, a unique sample that includes columnar and equiaxed grains was successfully prepared using magnetic-field-assisted directional solidification. Subsequently, the mechanical behavior and detwinning evolution of the Ni-Mn-Ga specimen under compressive loading were studied. A general criterion is proposed to elucidate the compressive-stress-induced detwinning evolution based on the Schmid factor and deformation gradient tensor. The γ phase significantly enhanced the mechanical behavior of both the columnar and equiaxed grain samples. In particular, the random distribution of the γ phase was more prone to hindering fracture, even resulting in a larger compression strain in the polycrystalline Ni-Mn-Ga sample. This work highlights the effect of a magnetic field on the microstructure and also provides an in-depth understanding of the detwinning mechanism in Ni-Mn-Ga alloys containing the γ phase.
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