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Mechanical Properties of Cr 2 AlC Ceramics
Author(s) -
Tian Wubian,
Wang Peiling,
Zhang Guojun,
Kan Yanmei,
Li Yongxiang
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01634.x
Subject(s) - flexural strength , materials science , composite material , ceramic , graphite , indentation , hot pressing , compressive strength , phase (matter) , chemistry , organic chemistry
Dense and predominantly single‐phase samples of Cr 2 AlC, together with a trace amount of Cr 7 C 3 , 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 Cr 2 AlC samples were 5.2, 288 GPa, 483±29, and 1159±23 MPa, respectively, which are comparable with those of Ti 3 AlC 2 and Nb 2 AlC. 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 Cr 2 AlC 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.