Synthesis and mechanical properties of high-purity Cr2AlC ceramic

被引：60
|
作者：
Ying, Guobing [1 ]
He, Xiaodong [1 ]
Li, Mingwei [2 ]
Han, Wenbo [1 ]
He, Fei [1 ]
Du, Shanyi [1 ]
机构：
[1] Harbin Inst Technol, Ctr Composite Mat & Struct, Harbin 150080, Heilongjiang, Peoples R China
[2] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Cr2AlC; M(n+1)AX(n); Delamination; Kink band; Mechanical properties; LIQUID REACTION SYNTHESIS; NONLINEAR ELASTICITY; BULK CR2ALC; KINK BANDS; TI3SIC2; TI3ALC2; TI2ALC; OXIDATION; AL; MICROSTRUCTURE;
D O I：
10.1016/j.msea.2010.12.039
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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/cm(3). 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. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：2635 / 2640
页数：6
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