Microstructure and mechanical properties of a Cr2Al(Si)C solid solution
Microstructure and mechanical properties of a Cr2Al(Si)C solid solution
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DOI：
10.1016/j.msea.2010.05.093
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发表时间：
2010-08
期刊：
影响因子：
6.4
通讯作者：
Wenbo Yu;Shibo Li;W. Sloof
中科院分区：
文献类型：
--
作者：
Wenbo Yu;Shibo Li;W. Sloof
将铬、铝、硅、碳摩尔比为2：1.1：0.2：1的铬、铝、硅和碳粉的混合物在1450℃、30 MPa、Ar气氛中热压1h，合成了一种新的Cr2Al(Si)C固溶体。用X射线衍射仪和扫描电子显微镜对其相组成和微观结构进行了分析。Cr2Al(Si)C固溶体呈层状结构。测定了Cr2Al(Si)C固溶体的抗弯强度、断裂韧性和维氏硬度，并与合成的Cr2AlC进行了比较。在压痕周围和断口上广泛观察到层状结构的屈曲和扭曲以及晶界分层裂纹的偏转。这些多重能量吸收机制赋予出售的溶液在室温下具有损伤容限和微尺度塑性。
A new Cr2Al(Si)C solid solution has been synthesized by hot pressing a mixture of Cr, Al, Si and C powders with a molar ratio of 2:1.1:0.2:1 at 1450°C with 30MPa for 1h in Ar atmosphere. The phase composition and microstructure was investigated with X-ray diffraction analysis and scanning electron microscopy. The Cr2Al(Si)C solid solution exhibits a layered structure. The flexural strength, fracture toughness and Vickers hardness of the Cr2Al(Si)C solid solution was determined and compared with the values for synthesized Cr2AlC. Buckling and kinking of the layered structure as well as grain delamination crack deflection were extensively observed around indentations and on the fracture surfaces. These multiple energy-absorbing mechanisms endow the sold solution with damage tolerance and micro-scale plasticity at room temperature.