Synthesis and mechanical properties of high-purity Cr<sub>2</sub>AlC ceramic期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Synthesis and mechanical properties of high-purity Cr₂AlC ceramic

Authors:	Guobing YingXiaodong He Mingwei LiWenbo Han Fei HeShanyi Du

Affiliation:	^a Center for Composite Materials and Structures, Harbin Institute of Technology, No. 2 Yikuang Street, Heilongjiang, Harbin 150080, China ^b National Key Lab for Precision Hot Processing of Metal, Harbin Institute of Technology, Harbin 150001, China

Abstract:	High-purity and dense Cr₂AlC has been successfully fabricated by hot-pressing, using Cr, Al and graphite as raw materials. Delamination, kink bands, monolamellar kink, transgranular crack and transgranular fracture of bulk Cr₂AlC are found during the room-temperature test. The density, Vickers hardness, flexural strength, Young's modulus, compressive strength and fracture toughness of the Cr₂AlC are 5.17 g/cm³, 4.9 GPa, 469 ± 27 MPa, 282 GPa, 949 ± 22 MPa and 6.22 ± 0.26 MPa m^1/2, respectively. The strength of Cr₂AlC could be greatly improved by second phase of Cr₇C₃. And the slipping of basal planes and slip system cold be hindered by Cr₇C₃, thus resulting in a lower toughness.

Keywords:	Cr₂AlC M_n+1AX_n Delamination Kink band Mechanical properties
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