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

作者：Yu, Wenbo^*; Zhao, Hongbin; Hu, Xiaoshi^*

来源：Journal of Alloys and Compounds, 2018, 732: 894-901.

DOI：10.1016/j.jallcom.2017.10.255

• Texture
• Ti2AlC MAX phases
• Magnesium composite
• Anisotropic

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.

• 出版日期2018-1-25
• 单位北京交通大学; 哈尔滨工业大学; 北京有色金属研究总院