Zhihua Nie
Beijing Institute of Technology
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Zhihua Nie.
Applied Physics Letters | 2011
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
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
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
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
Zilong Wang; Zhihua Nie; Junxi Zeng; R. Su; Yuepeng Zhang; Dennis E. Brown; Yang Ren; Yandong Wang
Advanced Engineering Materials | 2010
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
Danlu Zhang; Zhihua Nie; Zilong Wang; L. Huang; Qinghua Zhang; Yandong Wang
Acta Materialia | 2017
Lili Ma; Lu Wang; Zhihua Nie; Fuchi Wang; Yunfei Xue; Jinlian Zhou; Tangqing Cao; Yandong Wang; Yang Ren
Journal of Alloys and Compounds | 2016
Ran Shi; Zhihua Nie; Qunbo Fan; Guoju Li
Intermetallics | 2014
Junxi Zeng; Zilong Wang; Zhihua Nie; Yandong Wang