| 摘要 |
PURPOSE:To improve thermal fatigue-resisting strength by subjecting an Al alloy stock which is locally melted by means of a high density energy heat ray and rapidly cooled to solution heat treatment and then to artificial aging treatment. CONSTITUTION:The Al alloy stock is irradiated with the high density energy heat ray, for example, laser beam etc., while shifting the ray, so that the surface undergoes local melting, which is then cooled rapidly. Subsequently, the stock is heated at 480-520 deg.C for 4-10Hr to undergo solution heat treatment and is then hardened, followed by artificial aging treatment, e.g. at 170-200 deg.C for 6-10Hr.
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