Optimization in both alloy composition and manufacture process has been required to obtain the TiNi X compounds with high strength and oxidation resistance. Both Ti 49 molNi 1 molCr and Ti 45Ni 5Cr were designed for the achievement of tensile strength of 500 MPa and 800 MPa, respectively, and high oxidation resistance, by the d electrons concept. The levitation melted castings showed the limited contamination amount and homogeneous microstructure. The values of tensile strength for Ti 49Ni 1Cr and Ti 45Ni 5Cr castings without solidification defects were 585 MPa and 840 MPa, which meant the achievement of the target values. The oxidation amount of Ti 45Al 5Cr was 0.28 times, compared with Ti 50Ni. It is concluded that TiNi X intermetallic compounds having the objective constructed phase, tensile strength and oxidation resistance, are obtained successfully by the theoretical alloy design, without doing any trial and error experiments.
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