Mechanical Properties of Cr2AlC Ceramics
Mechanical Properties of Cr2AlC Ceramics
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DOI：
10.1111/j.1551-2916.2007.01634.x
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发表时间：
2007-05
影响因子：
3.9
通讯作者：
W. Tian;Pei-ling Wang;Guo‐Jun Zhang;Y. Kan;Yongxiang Li
中科院分区：
文献类型：
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作者：
W. Tian;Pei-ling Wang;Guo‐Jun Zhang;Y. Kan;Yongxiang Li
通过将铬、铝和石墨粉末的混合物在1400°C下热压1小时，制备了致密且主要为单相的Cr2AlC样品以及痕量的Cr7C3。Cr2AlC样品的硬度、杨氏模量、弯曲强度和压缩强度分别为5.2、288 GPa、483±29和1159±23 MPa，这与Ti3AlC2和Nb2AlC的那些相当。该材料具有良好的损伤容限。对于高达50 N的压痕载荷，压痕后弯曲强度降低约10%，对于100 N的载荷降低31%。从300°C淬火到室温，Cr2AlC试样的抗弯强度从483 MPa下降到455 MPa，而当淬火温度升高到500°C时，残余强度迅速下降到199 MPa。淬火温度进一步提高到700° C、900° C和1100°C，导致强度略有降低。
Dense and predominantly single-phase samples of Cr2AlC, together with a trace amount of Cr7C3, were fabricated by hot pressing of a mixture of chromium, aluminum, and graphite powders at 1400°C for 1 h. The hardness, Young's modulus, flexural strength, and compressive strength of Cr2AlC samples were 5.2, 288 GPa, 483±29, and 1159±23 MPa, respectively, which are comparable with those of Ti3AlC2 and Nb2AlC. The material exhibits good damage tolerance. For indentation loads up to 50 N, the post-indentation flexural strengths decrease by approximately 10% and by 31% for a load of 100 N. The flexural strengths of Cr2AlC samples quenched from 300°C to room temperature decrease from 483 to 455 MPa, while the retained strengths decrease quickly to 199 MPa when the quench temperature increases to 500°C. A further increase in quench temperature to 700°, 900°, and 1100°C results in a small reduction of strength.