| 摘要 |
PROBLEM TO BE SOLVED: To provide a TiAl-made internal combustion engine component, particularly a valve or a piston pin, which has high temperature high strength and high rigidity, and also is improved in ductility. SOLUTION: The internal combustion engine component are produced through: an extruding process where a TiAl alloy containing, by atom, 40 to 42% Al and 2.4 to 2.6% Cr, and the balance Ti with inevitable impurities is extruded at 1,100 to 1,150°C at an extrusion ratio of≥10 so as to obtain a molded body; an annealing process where, after the completion of the extruding process or during the extruding process, the molded body is held at 950 to 1,050°C for 2 to 5 h in a vacuum; and a cooling process where the molded body subjected to the annealing process is cooled to 400°C at a cooling speed of 10 to 60°C/min in an inert gas. COPYRIGHT: (C)2011,JPO&INPIT
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