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Dive into the research topics where Dewei Zhao is active.

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Featured researches published by Dewei Zhao.


Scientific Reports | 2016

Giant and reversible room-temperature elastocaloric effect in a single-crystalline Ni-Fe-Ga magnetic shape memory alloy

Yang Li; Dewei Zhao; Jian Liu

Good mechanical properties and large adiabatic temperature change render Heusler-type Ni2FeGa-based magnetic shape memory alloys as a promising candidate material for solid-state mechanical cooling application at ambient conditions. Superelastic behavior and associated elastocaloric effect strongly reply on deformation conditions (e.g. applied strain rate and strain level) of stress-induced martensitic transformations. With the aim of developing high-performance elastic cooling materials, in this work, we have carried out a systematic study on a Ni54Fe19Ga27 [420]-oriented single crystal by exploring the interaction between dynamic deformation parameters and thermal response. A giant and reversible adiabatic temperature change of ±7.5u2009K triggered by a low stress of 30u2009MPa was achieved. Such a high specific cooling performance thus offers the great advantage for the small scale solid-state mechanical cooling applications. Besides, a significant temporary residual strain effect has been observed at high strain rate, which is unfavorable for reversible elastocaloric effect but can be overcome by reducing stress hysteresis, and/or by elevating initial environmental temperature. The established criterion for the desirable reversible elastocaloric properties goes beyond the present system, and can be applicable for other shape memory alloys used for elastic cooling techniques.


Applied Physics Letters | 2017

Giant elastocaloric effect and its irreversibility in [001]-oriented Ni45Mn36.5In13.5Co5 meta-magnetic shape memory alloys

Dewei Zhao; Jian Liu; Yan Feng; Wen Sun; Aru Yan

In this letter, we investigate the elastocaloric reversibility in Ni-Mn-In-Co meta-magnetic shape memory alloys. A highly [001] textured Ni45Mn36.5In13.5Co5 polycrystalline alloy was grown by using the liquid-metal-cooling directional solidification technique. We have observed a giant adiabatic temperature change (ΔT) of +8.6u2009K caused by the stress-driven complete martensitic transformation. The asymmetry of the maximum ΔT between loading and unloading strongly depends on the magnitude of superelastic strain. Such an irreversible behavior is ascribed to the friction energy dissipation as well as the variation of the elastocaloric entropy change by shifting initial temperatures.


APL Materials | 2017

Combined caloric effects in a multiferroic Ni–Mn–Ga alloy with broad refrigeration temperature region

Yong Hu; Zongbin Li; Bo Yang; Suxin Qian; Weimin Gan; Y.Y. Gong; Yang Li; Dewei Zhao; Jian Liu; Xiang Zhao; Liang Zuo; Dunhui Wang; Y.W. Du

Solid-state refrigeration based on the caloric effects is promising to replace the traditional vapor-compressing refrigeration technology due to environmental protection and high efficiency. However, the narrow working temperature region has hindered the application of these refrigeration technologies. In this paper, we propose a method of combined caloric, through which a broad refrigeration region can be realized in a multiferroic alloy, Ni–Mn–Ga, by combining its elastocaloric and magnetocaloric effects. Moreover, the materials’ efficiency of elastocaloric effect has been greatly improved in our sample. These results illuminate a promising way to use multiferroic alloys for refrigeration with a broad refrigeration temperature region.


ACS Applied Materials & Interfaces | 2018

Energy-efficient Elastocaloric Cooling by Flexibly and Reversibly Transferring Interface in Magnetic Shape Memory Alloys

Yang Li; Dewei Zhao; Jian Liu; Suxin Qian; Zongbin Li; Weimin Gan; Xian Chen

Elastocaloric cooling is currently under extensive study owing to its great potential to replace the conventional vapor-compression technique. In this work, by employing multiscale characterization approaches, including in situ neutron diffraction in a loading frame, in situ transmission electron microscopy observation at different temperatures, in situ synchrotron X-ray Laue microdiffraction, and high-resolution infrared thermal imaging, we have investigated the thermal and stress-induced martensitic transformation, the stability of superelastic behavior and the associated elastocaloric effect for a Heusler-type Ni50.0Fe19.0Ga27.1Co3.9 single crystal. On the basis of transformation from cubic austenite into monoclinic martensite with a flexibly and reversibly transferring interface, this unique single crystal exhibits a giant elastocaloric effect of 11 K and ultralow fatigue behavior during above 12u2009000 mechanical cycles. The numerical simulation shows that the Ni50.0Fe19.0Ga27.1Co3.9 alloy offers 18% energy saving potential and 70% cooling capacity enhancement potential compared to the conventional shape-memory nitinol alloy in a single-stage elastocaloric cooling system, making it a great candidate for energy-efficient air conditioner applications.


Shape Memory and Superelasticity | 2017

Exploring Magnetic Elastocaloric Materials for Solid-State Cooling

Jian Liu; Dewei Zhao; Yang Li

In the past decade, there has been an increased surge in the research on elastocaloric materials for solid-state refrigerators. The strong coupling between structure and magnetism inspires the discovery of new multi-field driven elastocaloric alloys. This work is devoted to magnetic shape memory alloys suitable for mechanical cooling applications. Some novel characteristics in magnetostructural transition materials other than conventional shape memory alloys are overviewed. From the physical and engineering points of view, we have put forward general strategies to maximize elastocaloric temperature change to increase performance reversibility and to improve mechanical properties. The barocaloric effect as a sister-cooling alternative is also discussed.


Journal of Alloys and Compounds | 2015

Localization effect in green light emitting InGaN/GaN multiple quantum wells with varying well thickness

W. Liu; D. G. Zhao; D. S. Jiang; P. Chen; Z. S. Liu; J.J. Zhu; Mingli Shi; Dewei Zhao; X. Li; J. P. Liu; Suyun Zhang; H. Wang; H. Yang


Acta Materialia | 2017

Giant caloric effect of low-hysteresis metamagnetic shape memory alloys with exceptional cyclic functionality

Dewei Zhao; Jian Liu; Xian Chen; Wen Sun; Yang Li; Mingxiao Zhang; Yanyan Shao; H.J. Zhang; Aru Yan


Scripta Materialia | 2017

An 8K elastocaloric temperature change induced by 1.3% transformation strain in Ni44Mn45−xSn11Cux alloys

Yang Li; Wen Sun; Dewei Zhao; Hui Xu; Jian Liu


Scripta Materialia | 2017

Elastocaloric effect in a Co50Ni20Ga30 single crystal

Ao Shen; Dewei Zhao; Wen Sun; Jian Liu; Caiju Li


Superlattices and Microstructures | 2015

A modified structure with asymmetric and doping barrier interlayers of GaAs-based laser diodes with both small vertical divergence angle and low threshold current

X. Li; D. G. Zhao; D. S. Jiang; P. Chen; Z. S. Liu; Mingli Shi; Dewei Zhao; W. Liu; J.J. Zhu; Suyun Zhang; H. Yang

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Jian Liu

Chinese Academy of Sciences

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Wen Sun

Chinese Academy of Sciences

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Yang Li

Chinese Academy of Sciences

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Zongbin Li

Northeastern University

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Ao Shen

Chinese Academy of Sciences

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Aru Yan

Chinese Academy of Sciences

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D. G. Zhao

Chinese Academy of Sciences

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D. S. Jiang

Chinese Academy of Sciences

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H. Yang

Chinese Academy of Sciences

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J.J. Zhu

Chinese Academy of Sciences

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