公开(公告)号：US20130216426A1

公开(公告)日：2013-08-22

申请号：US13847737

申请日：2013-03-20

Applicant: Alcoa Inc.

Inventor： David A. Tomes, Jr. ,  Gavin F. Wyatt-Mair ,  David W. Timmons ,  Ali Unal

IPC: B22D25/06

CPC classification number: B22D25/06 ,  B22D11/0605 ,  B22D11/112 ,  C22C21/00

Abstract: The present invention discloses a method of strip casting an aluminum alloy from immiscible liquids that yields a highly uniform structure of fine second phase particles. The results of the present invention are achieved by using a known casting process to cast the alloy into a thin strip at high speeds. In the method of the present invention, the casting speed is preferably in the region of about 50-300 feet per minute (fpm) and the thickness of the strip preferably smaller than 0.08-0.25 inches. Under these conditions, favorable results are achieved when droplets of the immiscible liquid phase nucleate in the liquid ahead of the solidification front established in the casting process. The droplets of the immiscible phase are engulfed by the rapidly moving freeze front into the space between the Secondary Dendrite Arms (SDA).

Abstract translation: 本发明公开了一种从不混溶的液体中铸造铝合金的方法，其产生高度均匀的细小的第二相颗粒的结构。 本发明的结果是通过使用已知的铸造工艺来将合金高速铸造成薄带来实现的。 在本发明的方法中，铸造速度优选在约50-300英尺/分钟（fpm）的范围内，并且带材的厚度优选地小于0.08-0.25英寸。 在这些条件下，当在铸造过程中建立的固化前沿之前的液体中的不混溶液相的液滴成核时，可获得良好的结果。 不混溶相的液滴被快速移动的冷冻前部吞入二次枝晶（SDA）之间的空间。