STUDY ON MICROSTRUCTURES AND AGING CHARACTERISTICS OF 7050 ALUMINUM ALLOY PLATE EXTRUDED FROM LOW FREQUENCY ELECTROMAGNETIC CASTING INGOT

Acta Metall Sin

2007, Vol. 43

Issue (9): 949-955 DOI:

Research Articles

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STUDY ON MICROSTRUCTURES AND AGING CHARACTERISTICS OF 7050 ALUMINUM ALLOY PLATE EXTRUDED FROM LOW FREQUENCY ELECTROMAGNETIC CASTING INGOT

Zhihao Zhao;;;

东北大学材料电磁过程教育部重点实验室

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Zhihao Zhao. STUDY ON MICROSTRUCTURES AND AGING CHARACTERISTICS OF 7050 ALUMINUM ALLOY PLATE EXTRUDED FROM LOW FREQUENCY ELECTROMAGNETIC CASTING INGOT. Acta Metall Sin, 2007, 43(9): 949-955 .

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Abstract The microstructures and aging characteristics of 7050 aluminum alloy plates extruded from low frequency electromagnetic casting and DC casting ingots have been studied. The results show that the plate extruded from LFEC ingot has a fine microstructure. After a constant extrusion process, the average diameter of grains of the plate extruded from LFEC ingot is about 10μm, and the plate extruded from DC ingot is about 20μm. Comparing with plate extruded from DC ingot, the plate extruded from LFEC ingot has a fast aging rate and much stronger ability of aging strengthening. Aging at 120℃, the plate extruded from LFEC ingot reaches its peak strength in 8 hours, and its longitudinal and the transverse strength are 656MPa and 596MPa respectively. However, the plate extruded from DC ingot reaches its the maximum value in 12 hours and its longitudinal and the transverse strength are 647MPa and 590MPa respectively.

Key words: 7050 aluminum alloy low frequency electromagnetic casting extrusion microstructures

Received: 07 February 2007

ZTFLH:

TF777，TG113.12

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2007/V43/I9/949

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