| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a titanium alloy increased in the content of group Va elements by which composition fluctuations and solidification segregation can be more reduced than ever before. SOLUTION: The manufacturing method comprises: a melting step in which vacuum arc melting is performed using, as a consumable electrode 1, of a powder compact prepared by compacting a uniform raw material powder of 20μm to 1 mm average particle size which is regulated into a desired overall composition consisting of a group of alloying elements including at least group Va elements and titanium as the main balance; a solidification step in which the resultant molten alloy 2 melted in the melting step is successively cooled to undergo solidification; and a heat treatment step in which the resultant alloy ingot 3 prepared by solidification in the solidification step is subjected to homogenizing heat treatment. By this method, the titanium alloy characterized as follows can be obtained: the above group of alloying elements is contained, when the total is 100 mass%, in an amount of 15 to 60 mass% in sum; and the "amount of element segregation" of the elements included in the group of alloying elements and Ti is made to≤0.9 mass%. The above "amount of element segregation" means the microscopic amount of segregation with respect to each element, occurring in a minute area of the titanium alloy. COPYRIGHT: (C)2007,JPO&INPIT
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