Microstructure and Hardness of 7055 Aluminum Alloy Processed by Circular Cryogenic-Aging Treatment

Hong Ming Wang; Guirong Li; Yun Cai; Yu Tao Zhao; Jun Jie Wang; Kai Xuan Gu; Hong Zhang

doi:10.4028/www.scientific.net/KEM.575-576.374

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 575-576Microstructure and Hardness of 7055 Aluminum Alloy...

Microstructure and Hardness of 7055 Aluminum Alloy Processed by Circular Cryogenic-Aging Treatment

Abstract:

7055 aluminum alloy was processed by circular cryogenic-aging treatments for four times. Some characters such as precipitates, dislocation density, crystal structure and micro hardness were studied in detail. It is showed that the sizes of precipitates are decreased from several hundred nanometers to 100nm with the increase of cycle index. The main components are AlZn or AlZnMg phases. The hardness test result illustrates that the micro hardness arrives at 232HV after circular cryogenic-aging treatment for twice. The corresponding precipitates exhibit high density and complex sizes. The sizes are in the range of 50-200nm.

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Key Engineering Materials (Volumes 575-576)

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374-377

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.575-576.374

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Online since:

September 2013

Authors:

Hong Ming Wang, Guirong Li, Yun Cai, Yu Tao Zhao, Jun Jie Wang, Kai Xuan Gu, Hong Zhang

Keywords:

Alloy, Metals, Microstructure, Nanocrystalline Materials

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