A new combinatorial approach to assess the influence of alloy composition on the oxidation behavior and concurrent oxygen-induced phase transformations for binary Ti-xCr alloys at 650 degrees C

摘要

Poor oxidation performance of Ti-based alloys is an important life-limiting factor for high temperature applications. In this paper, a combinatorial approach is used to investigate systematically the influence of composition and time on the oxidation of Ti-Cr system. A compositionally graded Ti-xCr specimen (0 <= x <= 40 wt%) was prepared and oxidized at 650 degrees C. The structure and composition of the oxide and near-surface region were studied and a critical composition of similar to 20 wt% Cr was identified above which the oxidation resistance is enhanced. Below the critical composition transition to a rapid breakaway oxidation was observed for extended exposure times. (C) 2015 The Authors. Published by Elsevier Ltd.