High temperature oxidation behaviors of Ti-Cr alloys with Laves phase TiCr2

The high temperature oxidation behaviors of Ti-Cr alloys containing 18% similar to 35%Cr with Laves phase TiCr2 were investigated at 650similar to780 degreesC for exposure up to 104 h. The results reveal that chromium content has critical significance to the oxidation resistance of the alloys. The scaling rates of the alloys with less than 21 % Cr are higher than those measured for pure titanium, but for the alloys with more than 26 % Cr their scaling rate is lowered by 1 similar to 2 times under the same oxidizing conditions. Both an external and an internal oxidation layers were observed. The oxidation resistance enhancement by chromium alloying is contributed to the formation of a continuous and compact chromic oxide interleaf in the scale. Oxidation temperature significantly affects the scaling rates of Ti-Cr alloys, and the mass gain is doubled with a temperature change from 650 degreesC to 700 degreesC or from 700 degreesC to 780 degreesC, for the same exposure duration. TiCr2 shows no negative influence on the high temperature oxidation resistance of the alloys.