Prof. Jinghua Jiang

As a kind of cost-efficient hydrogen storage materials with high hydrogen capacity and light weight, Mg-based alloys have attracted much attention. This review introduces an effective technique in producing bulk ultrafine-grained (UFG) Mg alloys and promoting its hydrogen storage property, namely, equal-channel angular pressing (ECAP). This paper briefly describes the technical principle of ECAP and reviews the research progress on hydrogen storage properties of ECAP-processed Mg alloys. Special attention is given to their hydrogen storage behaviors including hydrogen storage dynamics, capacity, and cycling stability. Finally, it analyzes the factors that affect the hydrogen storage properties of ECAP-processed Mg alloys, such as the grain sizes, lattice defects, catalysts, and textures introduced by ECAP process.

26 September 2018 in Metals

Journal Article

Multimodal Microstructure and Mechanical Properties of AZ91 Mg Alloy Prepared by Equal Channel Angular Pressing plus Aging

Developing cost-effective magnesium alloys with high strength and good ductility is a long-standing challenge for lightweight metals. Here we present a multimodal grain structured AZ91 Mg alloy with both high strength and good ductility, prepared through a combined processing route of low-pass ECAP with short-time aging. This multimodal grain structure consisted of coarse grains and fine grains modified by heterogeneous precipitates, which resulted from incomplete dynamic recrystallization. This novel microstructure manifested in both superior high strength (tensile strength of 360 MPa) and good ductility (elongation of 21.2%). The high strength was mainly attributed to the synergistic effect of grain refinement, back-stress strengthening, and precipitation strengthening. The favorable ductility, meanwhile, was ascribed to the grain refinement and multimodal grain structure. We believe that our microstructure control strategy could be applicable to magnesium alloys which exhibit obvious precipitation strengthening potential.

About Me

Jinghua Jiang received her B.Sc. from Yanshan University in 1994, her M.Sc. from Zhejiang University in 1997 and her Ph.D. from Southeast University in 2003. She has joined Hohai University and lectured since 2005. Currently, she is a professor at the College of Materials Science and Engineering, Hohai University. She has authorized more than 40 inventions and published more than 200 SCI journal papers. She won the first prize in the Jiangsu Science and Technology Progress Award, the Nanjing Natural Science Outstanding Paper Award and the Changzhou Municipal People’s Government Teaching Award. Her main research directions include (1). Preparation of nano/ultrafine grain/heterogeneous alloys and their structure-performance relationship; (2). Light alloys with integrated structure and function and their surface technology (conductive alloys/biomedical alloys, etc.); (3). New energy metals and their application design (hydrogen storage alloys, seawater battery anode materials, etc.); (4). Metal failure analysis and protection technology. In addition, she is a lifetime member of the Chinese Society of Materials.

Prof. Jinghua Jiang

Prof. Jinghua Jiang

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