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Effect of a New Solution and Aging Treatment

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Effect of a New Solution and Aging Treatment on the Microstructure
and Tensile Properties of the H755 Aluminum Alloy

Jianxiang Li, Zhibing Yang, Hoshion(Jeoshion) Aluminum Co. Ltd., Zhongshan,
Guangdong, China
Zhimin Yin, Central South University, Changsha, Hunan, China


ABSTRACT—The effect of a newly-developed solution and aging treatment on the
microstructure and tensile properties of the H755 aluminum alloy was investigated. Compared
with the conventional solution and aging treatment, the new solution and aging treatment leads to
increases in tensile strength and yield strength by 25MPa and 24MPa, respectively, while
elongation remains high (11.2 percent). During the new solution treatment, the first step at 460°C
for two hours makes the eutectic phases diffuse and dissolve, and the second step at 490°C for
one hour increases the extent of dissolution. Enhanced supersaturation in α-Al and an increased
volume fraction of precipitates are considered responsible for the enhanced strength of the alloy
after the aging treatment. During aging, the supersaturated solid solution becomes decomposed
and the GP zones and η′ phase form. With increasing aging time, the amount and sizes of
precipitates increase. With increasing aging temperature, the time to reach peak strength becomes
shorter and the peak strength decreases. At the same time, the equilibrium phases and
precipitate-free zones at the grain boundaries form. After aging at 120°C for 24 hours, the tensile
strength, yield strength, and elongation reach 752MPa ,700MPa, and 11.2 percent, respectively.

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