Mechanical Properties Of Pulse Discharge Sintered Cr_2alc At 25-1000 ℃

摘要

Ternary compound Cr_2AlC was synthesized by a reactive sintering process and its mechanical properties in the 25-1000 ℃ temperature range were studied by 4-point bending tests. The flexural strength of Cr_2AlC decreases continuously from 555±11 MPa at room temperature down to 100±4 MPa at 1000 ℃ and this strength decreasing tendency is more obvious as the testing temperature is higher than 900 ℃. The ductile-to-brittle transition temperature of Cr_2AlC locates in the range of 800-900 ℃. The macro-plastic deformation of Cr_2AlC is mainly attributed to the initiation and propagation of large number of microcracks.