Effect of aging on characterization of sr-modified stir cast A356/Al2O3 composite

Anne Zulfia Syahrial, Ahadya Pancasakti

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

6 Citations (Scopus)


A356/Al2O3 composites with Sr modifier were produced by stir casting process. The composites were further heat treated to obtain light material with superior characteristics through precipitation hardening of Mg2Si precipitate. The A356 alloy is reinforced with 10 %Vf Al2O3 micro particles. Small amount of Sr is added to modify eutectic silicon morphology from plate-like into fibrous. The composites were prepared by stir casting method in order to obtain dispersed reinforcement particulates within the matrix. T6 heat treatment is employed to the fabricated composites for 2, 4, 6, 8, and 10 hours of aging time to improve the properties. The result reveals that an optimum values of tensile strength, impact strength, hardness and wear rate are achieved by conducting 6 hours of aging. Longer than that, the properties will decline as a result of incoherent phase domination. Small amount of Sr is shown to be able to change the morphology of eutectic silicon from plate-like into fibrous. However, Fe-intermetallics formation, porosity, and negative effect from solution treatment due to improper technical condition during heat treatment are found to contribute on deterioration of mechanical properties of the material.

Original languageEnglish
Title of host publicationInternational Symposium on Advanced Material Research - ISAMR 2017
EditorsDong Keon Kim
PublisherTrans Tech Publications Ltd
Number of pages6
ISBN (Print)9783035711363
Publication statusPublished - 2017
EventInternational Symposium on Advanced Material Research, ISAMR 2017 - Seoul, Korea, Republic of
Duration: 17 Mar 201719 Mar 2017

Publication series

NameKey Engineering Materials
Volume753 KEM
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795


ConferenceInternational Symposium on Advanced Material Research, ISAMR 2017
Country/TerritoryKorea, Republic of


  • Al A356
  • AlO
  • Sr modifier
  • Stir casting
  • T6 heat treatment


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