Microstructural interactions during stress ageing a 7475 aerospace alloy

被引：22

作者：

Bakavos, D.

Prangnell, P. B.

Bes, B.

Eberl, F.

Grossmann, J. G.

机构：

[1] Univ Manchester, Ctr Mat Sci, Manchester M1 7HS, Lancs, England

[2] Alcan Ctr Rech, F-38341 Voreppe, France

[3] CCLRC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England

来源：

ALUMINIUM ALLOYS 2006, PTS 1 AND 2: RESEARCH THROUGH INNOVATION AND TECHNOLOGY | 2006年 / 519-521卷

关键词：

7475; Al-Zn-Mg-Cu; creep; ageforming; constant stress ageing; Small Angle X-ray Scattering; TEM; GP-I; GP-II zones; eta '; eta; alignment; preferential precipitate orientation;

D O I：

10.4028/www.scientific.net/MSF.519-521.333

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In industrial process, like creep-ageforming, materials are aged under load. To investigate the influence of an applied stress on the ageing behaviour of Cu bearing Al-7xxx series alloys, a 7475 alloy was aged under a constant tensile stress and analysed by means of Small Angle X-ray Scattering (SAXS) and TEM. Mechanical testing was also employed, to determine if there was any effect on the materials strength. The results show that during the early stages of ageing significant interactions takes place, which preferentially aligns one type of GP zone, as well as affecting their size and volume fraction. During the second stage ageing treatment, the applied stress was observed to cause more rapid over-ageing, by promoting the formation of the eta phase.

引用

页码：333 / 338

页数：6

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