Effect of solution treatment temperature on microstructure and mechanical properties of al-5.1Zn-2Mg-0.1Ti (wt. %) produced by squeeze casting

Risly Wijanarko, Irene Angela, Bondan Tiara Sofyan

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

1 Citation (Scopus)

Abstract

Al 7xxx alloy is a heat treatable Al alloy with superior strength. Solution treatment in precipitation hardening sequence of the alloy has an important role to dissolve second phases and bring vacancies out to form precipitates in the ageing process. Another strengthening can be done by Ti addition as grain refiner. As cast alloy by squeeze casting was homogenized at 400 °C for 4 h. Solution treatment was conducted at 220, 420, and 490 °C, followed by rapid quenching. Subsequent ageing was conducted at 130 °C for 48 h. Characterization was performed by optical microscope, SEM-EDS (Scanning Electron Microscopy-Energy Dispersive Spectroscopy), Rockwell hardness testing, XRD (X-Ray Diffraction), and STA (Simultaneous Thermal Analysis). Ti added alloy showed rounder grains, lower hardness, and more reduction in second phase volume fraction along with increasing solution treatment temperature than those in alloys without Ti addition. Otherwise, the alloy final hardness was increasing and higher after the ageing process due to higher second phase dissolution which leads to more precipitates formed.

Original languageEnglish
Title of host publicationAdvanced Manufacturing and Materials
EditorsUmemura Kazuo, Takashiro Akitsu, Harald Justnes, Ki-Bum Kim
PublisherTrans Tech Publications Ltd
Pages38-45
Number of pages8
ISBN (Print)9783035714043
DOIs
Publication statusPublished - 2018
Event2nd International Conference on Advanced Manufacturing and Materials, ICAMM 2018 - Tokyo, Japan
Duration: 11 Jun 201813 Jun 2018

Publication series

NameMaterials Science Forum
Volume939 MSF
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference2nd International Conference on Advanced Manufacturing and Materials, ICAMM 2018
CountryJapan
CityTokyo
Period11/06/1813/06/18

Keywords

  • Al-Zn-Mg
  • Precipitation hardening
  • Second phase dissolution
  • Solution treatment
  • Ti

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