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Featured researches published by Zhihua Nie.


Applied Physics Letters | 2011

Phase-stress partition and stress-induced martensitic transformation in NbTi/NiTi nanocomposite

Shijie Hao; Daqiang Jiang; Lishan Cui; Yongtian Wang; Xiaobin Shi; Zhihua Nie; Dennis E. Brown; Yang Ren

The phase-stress partition and stress-induced martensitic transformation in a NbTi/NiTi nanocomposite were investigated by employing in situ synchrotron x-ray diffraction during tensile cycling. The phase-stress partition behavior in the nanocomposite is significantly different from that previously reported in the metal-matrix composites. Beyond the initial elastic deformation, the stress carried by the NbTi nanowires increased significantly with increasing macroscopic strain, while the stress taken by the NiTi matrix decreased gradually. We also found that the stress-induced martensitic transformation of the NiTi matrix still proceeded even though the matrix carried decreasing stress rather than constant or increasing stress well known in binary NiTi alloys.


Applied Physics Letters | 2009

Evidence for preferential rearrangements of martensite variants by magnetic field in antiferromagnetic CoO crystal

Zhihua Nie; Yang Ren; Tomoyuki Terai; Yongtian Wang; Dennis E. Brown; Tomoyuki Kakeshita

The synchrotron high-energy x-ray diffraction provides the direct crystallographic evidence for the magnetic-field-driven preferential rearrangements of martensite multivariants in antiferromagnetic CoO crystal. When a magnetic field was incrementally applied up to 6 T on the CoO single crystal cooled below the Neel temperature, the martensite variants with the magnetization easy-axis parallel to the magnetic field direction (H) were consumed, while the variants with magnetic moments perpendicular to H were enhanced. The microscopic origin for the observation is discussed, which provides important information for understanding the magnetic-field-driven strain observed in the antiferromagnetic alloys, with a selection principle on martensite variants different from that found in the ferromagnetic shape memory alloys.


Applied Physics Letters | 2013

Low-field large magnetostriction in DyCo2 due to field-induced rearrangement of tetragonal variants

Zhihua Nie; Sen Yang; Yandong Wang; Zilong Wang; Dongmei Liu; Yang Ren

The synchrotron high-energy x-ray diffraction was used to trace directly the structural evolution of polycrystalline DyCo2, one of RT2 (Ru2009=u2009rare earth, Tu2009=u2009Co, Fe) compounds with Laves phase, as a function of temperature and magnetic field. When the DyCo2 compound was zero-field cooled down below TC, the high temperature cubic lattice was distorted into tetragonal structure, associated with an expansion of unit cell volume. It was further found that the large magnetostriction at low magnetic field was due to the preferential rearrangement of tetragonal variants in the low-temperature ferrimagnetic phase. Our finding of the field-driven preferential selection of tetragonal variants in the polycrystalline materials provides important clues for exploring the advanced ferromagnetic alloys with a large magnetostriction at low field.


Applied Physics Letters | 2015

Strain-induced dimensionality crossover of precursor modulations in Ni2MnGa

Zhihua Nie; Yandong Wang; Shun-Li Shang; Q. Zeng; Yang Ren; Dongmei Liu; Wenge Yang; Yi Wang; Zi-Kui Liu

Precursor modulations often occur in functional materials like magnetic shape memory alloys, ferroelectrics, and superconductors. In this letter, we have revealed the underlying mechanism of the precursor modulations in ferromagnetic shape memory alloys Ni2MnGa by combining synchrotron-based x-ray diffraction experiments and first-principles phonon calculations. We discovered the precursor modulations along [011] direction can be eliminated with [001] uniaxial loading, while the precursor modulations or premartensite can be totally suppressed by hydrostatic pressure condition. The TA2 phonon anomaly is sensitive to stress induced lattice strain, and the entire TA2 branch is stabilized along the directions where precursor modulations are eliminated by external stress. Our discovery bridges precursor modulations and phonon anomalies, and sheds light on the microscopic mechanism of the two-step superelasticity in precursor martensite.


Journal of Alloys and Compounds | 2013

First-order magnetostructural transformation in Fe doped Mn―Co―Ge alloys

Zilong Wang; Zhihua Nie; Junxi Zeng; R. Su; Yuepeng Zhang; Dennis E. Brown; Yang Ren; Yandong Wang


Advanced Engineering Materials | 2010

Low temperature deformation detwinning - a reverse mode of twinning.

Yandong Wang; Wenjun Liu; L. Lu; Yang Ren; Zhihua Nie; Jonathan Almer; Sheng Cheng; Yongfeng Shen; Liang Zuo; Peter K. Liaw; K. Lu


Journal of Magnetism and Magnetic Materials | 2015

Giant magnetocaloric effect in MnCoGe with minimal Ga substitution

Danlu Zhang; Zhihua Nie; Zilong Wang; L. Huang; Qinghua Zhang; Yandong Wang


Acta Materialia | 2017

Reversible deformation-induced martensitic transformation in Al 0.6 CoCrFeNi high-entropy alloy investigated by in situ synchrotron-based high-energy X-ray diffraction

Lili Ma; Lu Wang; Zhihua Nie; Fuchi Wang; Yunfei Xue; Jinlian Zhou; Tangqing Cao; Yandong Wang; Yang Ren


Journal of Alloys and Compounds | 2016

Elastic plastic deformation of TC6 titanium alloy analyzed by in-situ synchrotron based X-ray diffraction and microstructure based finite element modeling

Ran Shi; Zhihua Nie; Qunbo Fan; Guoju Li


Intermetallics | 2014

Crystal structural transformation accompanied by magnetic transition in MnCo1−xFexGe alloys

Junxi Zeng; Zilong Wang; Zhihua Nie; Yandong Wang

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Yang Ren

Argonne National Laboratory

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Yandong Wang

University of Science and Technology Beijing

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Zilong Wang

Beijing Institute of Technology

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Dennis E. Brown

Northern Illinois University

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Chengwen Tan

Beijing Institute of Technology

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Fuchi Wang

Beijing Institute of Technology

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D.Y. Cong

University of Science and Technology Beijing

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Dongmei Liu

Northeastern University

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Yongtian Wang

Beijing Institute of Technology

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H.N. Cai

Beijing Institute of Technology

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