Temperature dependence of mechanical properties of alloys on the basis of intermetallic TiAl

Abstract

Temperature dependence of strength and plasticity of alloys based on intermetallic TiAl has been investigated. The effect of niobium, chrome, molybdenum and some REM on phase composition, structure and mechanical characteristics of alloys based on titanium alluminides is described in this paper. Mechanical properties of alloys were determined by compression tests in the interval of temperatures from RT to 800^оС. Conformities to law of distribution of cracks were studied based on the results of fractography analyses of the samples, previously tested in bending; and based on surface relief analysis of compressed samples, one side of which was polished before compression. It is shown that the alloys alloyed by niobium in combination with other useful additions demonstrate strength above 1000 МPа, yield stress greater than 700 МPа and plasticity on a compression higher than 5% over a wide temperature range of tests, which makes them promising for use as structural materials. Full text download