搅拌摩擦加工优化Al-Si-Mg-Sc合金的力学性能

谢金财; 程伟; 余灿梅; 刘崇宇; 江鸿杰; 黄宏锋

doi:10.15980/j.tzzz.2022.05.009

研究·合金工艺 | 浏览量 : 0 下载量: 20 CSCD: 0

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搅拌摩擦加工优化Al-Si-Mg-Sc合金的力学性能
Mechanical Properties of Al-Si-Mg-Sc Alloys by Friction Stir Processing Optimization
2022年42卷第5期页码：569-573
纸质出版日期： 2022 ，
DOI： 10.15980/j.tzzz.2022.05.009

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谢金财, 程伟, 余灿梅, 等. 搅拌摩擦加工优化Al-Si-Mg-Sc合金的力学性能[J]. 特种铸造及有色合金, 2022,42(5):569-573.

Xie Jincai, Cheng Wei, Yu Canmei, et al. Mechanical Properties of Al-Si-Mg-Sc Alloys by Friction Stir Processing Optimization[J]. Special Casting & Nonferrous Alloys, 2022,42(5):569-573.
谢金财, 程伟, 余灿梅, 等. 搅拌摩擦加工优化Al-Si-Mg-Sc合金的力学性能[J]. 特种铸造及有色合金, 2022,42(5):569-573. DOI： 10.15980/j.tzzz.2022.05.009.

Xie Jincai, Cheng Wei, Yu Canmei, et al. Mechanical Properties of Al-Si-Mg-Sc Alloys by Friction Stir Processing Optimization[J]. Special Casting & Nonferrous Alloys, 2022,42(5):569-573. DOI： 10.15980/j.tzzz.2022.05.009.

摘要

分别对亚共晶与共晶Al-Si-Mg-Sc合金进行搅拌摩擦加工（FSP）及后续固溶时效（T6）热处理，研究了不同状态下Al-Si-Mg-Sc合金的微观结构及力学性能。结果表明，FSP可消除铸态合金的孔洞缺陷并破坏Si相网状结构，同时FSP还可碎化AlSi

及Al

（SiSc）

Fe等金属间化合物相。后续T6处理可促使FSP态合金内析出高密度β″相。FSP可大幅优化T6态亚共晶与共晶Al-Si-Mg-Sc合金的力学性能，FSP+T6态合金的强化机制包括析出强化及细小过剩相强化，其断裂模式为典型的韧性断裂。

Abstract

Friction stir processing（FSP） and subsequent solution and artificial aging（T6） treatment were conducted on hypoeutectic and eutectic Al-Si-Mg-Sc alloys

and the microstructure as well as mechanical properties of the alloy were investigated at different states. The results indicate that FSP can eliminate the hole defects and effectively destroy Si phase network structure

breaking intermetallic AlSi

（SiSc）

Fe phases in the casting alloy. T6 treatment can promote the precipitation of high density β″ phase in the FSP alloys. FSP can greatly optimize the mechanical properties of hypoeutectic and eutectic Al-Si-Mg-Sc alloys in T6 state. The strengthening mechanisms of the alloys with FSP and T6 treatment include precipitation strengthening and excess phase strengthening effects

and fracture mode is typical plastic fracture.