Anisotropic mechanical and physical properties in textured Ti2AlC reinforced AZ91D magnesium composite

JOURNAL OF ALLOYS AND COMPOUNDS

卷:732

Article

Yu, Wenbo¹  Zhao, Hongbin²  Hu, Xiaoshi³ 

[1] Beijing Jiaotong Univ, Sch Mech & Elect Control Engn, Ctr Mat Sci & Engn, Beijing 100044, Peoples R China

[2] Gen Res Inst Nonferrous Met, State Key Lab Adv Mat Smart Sensing, Beijing 100088, Peoples R China

[3] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China

关键词: Texture;    Ti2AlC MAX phases;    Magnesium composite;    Anisotropic;   

DOI  :  10.1016/j.jallcom.2017.10.255

来源: Elsevier

【 摘 要 】

The textured 10% volTi(2)AlC reinforced AZ91D magnesium composite's cross section in parallel (//ED) and perpendicular (perpendicular to ED) to extruded axis was investigated, compared with the textured AZ91D and as-cast 10% volTi(2)AlC -AZ91D composite. With the introduction of Ti2AlC particles, the micro-sized Mg17Al12 precipitates previously found in extruded AZ91D became nano-sized and dispersed in composite. This change stimulated the Orowan strengthening effect in yield strength. As Ti2AlC particles were reoriented after hot extrusion, tensile and compressive tests provide evidence of stronger anisotropy in textured composite than the textured AZ91D alloy. At the same time, the different fracture mechanisms were proposed. Furthermore, the changes in slope of the resistivity with temperature (d rho/dT) and electrical resistivity ratio R293(K)/R77(K) (RRR) between //ED and perpendicular to ED specimens confirm Ti2AlC do contribute in the AZ91 alloy to the scattering of the conductive free electrons. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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