Effect of the Zn/mg RATIO on microstructure and mechanical properties in Al-Zn-Mg alloys

Masatomo Nishi, Kenji Matsuda, Naoya Miura, Katsumi Watanabe, Susumu Ikeno, Tomoo Yoshida, Satoshi Murakami

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

12 Scopus citations

Abstract

It is well know that the 7000 series Al-Zn-Mg alloy has good age hardening ability and high strength among commercial aluminum alloys. In this study, hardness measurement, tensile test, SEM and TEM observation have been performed in order to understand the effect of the Zn/Mg ratio on age hardening behaviour in Al-Zn-Mg alloys. It was seen from hardness measurement that the peak hardness increased with increasing amount of Zn and Mg. Tensile tests were performed for the samples of peak aged condition. It was seen that UTS increased with increasing amount of the Zn and Mg. The elongation decreased with increasing the amount of the Zn and Mg. Intregranular fracture was observed in alloys with low amount of Zn and Mg.Transgranular fracture was observed with high amount of Zn and Mg alloy. TEM observation was performed for peak aged samples. The size of precipitates became finer and the number density increased with increasing Zn and Mg contents.T' Phase and h1 phase were observed in low Zn/Mg alloy. The h' phase was observed in high Zn/Mg alloy.

Original languageEnglish
Title of host publicationAluminium Alloys, ICAA 2014
EditorsKnut Marthinsen, Bjørn Holmedal, Yanjun Li
PublisherTrans Tech Publications Ltd
Pages479-482
Number of pages4
ISBN (Print)9783038351207
DOIs
StatePublished - 2014
Event14th International Conference on Aluminium Alloys, ICAA 2014 - Trondheim, Norway
Duration: 2014/06/152014/06/19

Publication series

NameMaterials Science Forum
Volume794-796
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference14th International Conference on Aluminium Alloys, ICAA 2014
Country/TerritoryNorway
CityTrondheim
Period2014/06/152014/06/19

Keywords

  • Age hardening
  • Al-Zn-Mg
  • Precipitates
  • TEM
  • Tensile test

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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