Effect of Ti Addition to Age Hardening Response of Al-10Zn-6MgxTi Alloy Produced by Squeeze Casting

Dwi Ayu Nurcahyaningsih, Risly Wijanarko, Irene Angela, Bondan Tiara Sofyan

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

This research focused on investigating the effects of Ti addition on the age hardening response of Al 7xxx alloy for Organic Rankine Cycle (ORC) turbine impeller application in power plant generators. Al-10Zn-6Mg wt. % alloys were produced by squeeze casting with 0.02, 0.05, and 0.25 wt. % Ti addition. As-cast samples were homogenized at 400 °C for 4 h. Solution treatment was conducted at 440 °C for 1 h, followed by quenching and ageing at 130 °C for 200 h. Age hardening result was observed using Rockwell B hardness measurement. Other characterizations included impact testing, STA, optical microscopy, and SEM-EDS. Results showed that the addition of Ti in all content variations increased the as-cast hardness due to the diminution of secondary dendrite arm spacing (SDAS) values of the alloy. Ageing at 130 °C strengthened the alloys, however the addition of Ti was not found to affect neither peak hardness nor impact values of the alloy. Identities of second phases formed during solidification were found to be T (Mg 32 (Al,Zn) 49 ), β (Al 8 Mg 5 ), and TiAl 3 , while precipitates produced during ageing were GP Zone, η′, and η (MgZn 2 ).

Original languageEnglish
Article number02009
JournalMATEC Web of Conferences
Volume186
DOIs
Publication statusPublished - 6 Aug 2018
Event7th International Conference on Engineering Mathematics and Physics, ICEMP 2018 - Prague, Czech Republic
Duration: 15 Jun 201818 Jun 2018

Keywords

  • Ageing
  • Al-Zn-Mg
  • Grain refining
  • MgZn2
  • Ti addition

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