Title:
METHOD OF SUPPRESSING GRAIN GROWTH IN AL-ZN-MG-BASED ALUMINUM ALLOY BILLET FOR THIXOEXTRUSION
Document Type and Number:
WIPO Patent Application WO/2010/068009
Kind Code:
A2
Abstract:
The present invention relates to a method of suppressing grain growth in an AL-ZN-MG-based aluminum alloy billet for thixoextrusion which is characterized by comprising a Sc-adding step of adding Sc of 0.05~0.15% to molten metal, and a heating step including more than 3 steps of heating treatment processes for the billet moulded from the molten metal. Here, Sc may be added to the molten metal as a master alloy of Al-2 weight percent, and there may be 5 to 10 minutes of sustain time after completion of each heating process. The grain growth rate of the aluminum alloy billet manufactured according to the method of the present invention is below 10% based on the area of the initial grain. Therefore, the method of the present invention is economical because the AL-ZN-MG-based aluminum alloy billet having the low grain growth rate can be manufactured without an additional equipment or cost. Besides, the method offers a billet that has a fine and uniform grain on the inside and the outside.
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Inventors:
LIM, Su Gun (110-401, Deulmalheunghan Apt. Pyeonggeo-don, Jinju-si Gyeongsangnam-do 660-776, 660-776, KR)
임수근 (경상남도 진주시 평거동 들말흥한아파트 110-401, 660-776 Gyeongsangnam-do, 660-776, KR)
KIM, Tae Hoon (113-12, Sammun-dongMilyang-si, Gyeongsangnam-do 627-150, 627-150, KR)
임수근 (경상남도 진주시 평거동 들말흥한아파트 110-401, 660-776 Gyeongsangnam-do, 660-776, KR)
KIM, Tae Hoon (113-12, Sammun-dongMilyang-si, Gyeongsangnam-do 627-150, 627-150, KR)
Application Number:
KR2009/007298
Publication Date:
June 17, 2010
Filing Date:
December 08, 2009
Export Citation:
Assignee:
INDUSTRY-ACADEMIC COOPERATION FOUNDATION GYEONGSANG NATIONAL UNIVERSITY (900 Gajwa-dong, Jinju-si, Gyeongsangnam-do 660-701, 660-701, KR)
경상대학교 산학협력단 (경상남도 진주시 가좌동 900, 660-701 Gyeongsangnam-do, 660-701, KR)
LIM, Su Gun (110-401, Deulmalheunghan Apt. Pyeonggeo-don, Jinju-si Gyeongsangnam-do 660-776, 660-776, KR)
임수근 (경상남도 진주시 평거동 들말흥한아파트 110-401, 660-776 Gyeongsangnam-do, 660-776, KR)
경상대학교 산학협력단 (경상남도 진주시 가좌동 900, 660-701 Gyeongsangnam-do, 660-701, KR)
LIM, Su Gun (110-401, Deulmalheunghan Apt. Pyeonggeo-don, Jinju-si Gyeongsangnam-do 660-776, 660-776, KR)
임수근 (경상남도 진주시 평거동 들말흥한아파트 110-401, 660-776 Gyeongsangnam-do, 660-776, KR)
International Classes:
B22D21/04; B22D27/00; B22D21/00; B22D27/00
Attorney, Agent or Firm:
KWON, Hyuk-Soo et al. (3rd Fl, 827-25 Yeoksam-don, Kangnam-ku Seoul 135-080, 135-080, KR)
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