Vacuum Rolling Cladding Technology for Heavy Thick High-Strength Al Alloy Plate

doi:10.12068/j.issn.1005-3026.2021.05.004

Abstract

Abstract: In order to improve the segregation， loose， and porosity in the center region of heavy thick high-strength Al alloy plate， a rolling cladding technique was developed based on vacuum friction stir welding (FSW). The process included the surface treatment， vacuum FSW， hot-roll cladding， and heat treatment. The 7050-Al alloy blanks were welded by FSW at 0.01Pa， and then were cladding by hot rolling at 450℃ with the total reduction ratio of 75%. Subsequently， the cladding plate was subjected to the solid-solution and aging heat treatments. No any crack or porosity was observed at the cladding interface， and the original cladding interface disappeared， only remaining a few of fine and dispersed MgO particles on it. The shear strength of the cladding interface is up to 266MPa， which reaches 99% of the substrate strength， so that an excellent metallurgical bonded interface is obtained.

Key words: aluminum alloy; heavy thick plate; vacuum friction stir welding; rolling cladding; cladding interface

CLC Number:

TG335.58

XIE Guang-ming， ZHOU Li-cheng， LUO Zong-an， WANG Guo-dong. Vacuum Rolling Cladding Technology for Heavy Thick High-Strength Al Alloy Plate[J]. Journal of Northeastern University(Natural Science), 2021, 42(5): 633-639.

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