| 摘要 |
PURPOSE:To improve plastic workability, and above all, forgeability, by forming an ingot wherein the specific amt. or above of crystal grains is of a specific grain size or below and specific % or above of the secondary dentrite arm spacing has the texture of a specific value or below and forming the cast ingot into the shape having an acute angled part in the cross section. CONSTITUTION:A titled ingot is a continuously cast ingot of Al or Al alloy. >=85% part of crystal grains thereof is made to have the grain size of <=80 micron and >=90% part of secondary dentrite arm spacing is made to be the texture of <=15 microns. The cast ingot is made into the shape of which the cross section has at least one substantially acute angled part. The acute angled part is not limited to the shape of a sharp pointed tip and the pointed tip which is cut small by straight line or curved line is equally well. |
