A variety of microstructures in Mg/Cu super-laminate composites caused by competitive reactions during hydrogenation

17th International Conference on Textures of Materials

材料科学;物理学

Tanaka, K.^1 ; Shibata, K.^2 ; Nishida, Y.^2,3 ; Kurumatani, K.^2,4 ; Kondo, R.^2 ; Kikuchi, S.^5 ; Takeshita, H.T.^2

National Institute of Advanced Industrial Science and Technology (AIST), Osaka, Japan^1

Kansai University, Osaka, Japan^2

LIXIL Corporation, Tokyo, Japan^3

Fukunishi Foundry Co., Ltd., Osaka, Japan^4

University of Shiga Prefecture, Shiga, Japan^5

关键词: 3D networks;    Competitive reactions;    Cu powders;    Laminate composites;    Low temperatures;    SEM observation;    Threedimensional (3-d);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/82/1/012078/pdf
DOI  :  10.1088/1757-899X/82/1/012078

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A variety of microstructures in Mg/Cu super-laminate composites (SLCs) caused by competitive reactions during hydrogenation has been shown experimentally. Two types of MgCu2structures, three-dimensional (3-D) network and layer, were observed after initial hydrogenation of Mg/Cu SLCs under the conditions of 573K, 86.4ks in H2of 3-3MPa. It was proposed that Mg/Cu SLCs could be hydrogenated by two kinds of processes. The one is alloying Mg with Cu to form Mg2Cu followed by hydrogenation of Mg2Cu, leading to the formation of 3-D network of MgCu2. The other is hydrogenation of Mg followed by the reaction of MgH2to Cu, leading to the formation of layer MgCu2. SEM observations revealed that there existed Mg2Cu nano-crystals at the interface between Mg and Cu in as-rolled Mg/Cu SLCs, and layer MgCu2at the interface between MgH2and Cu in pellets of MgH2powder and Cu powder heated under the conditions of 673K, 86.4ks in H2of 8.0 MPa. The existence of Mg2Cu nano-crystals enables alloying Mg with Cu at low temperatures (