TY - GEN
T1 - Effect of aging on characterization of sr-modified stir cast A356/Al2O3 composite
AU - Syahrial, Anne Zulfia
AU - Pancasakti, Ahadya
N1 - Publisher Copyright:
© 2017 Trans Tech Publications, Switzerland.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
KW - Al A356
KW - AlO
KW - Sr modifier
KW - Stir casting
KW - T6 heat treatment
UR - http://www.scopus.com/inward/record.url?scp=85028763045&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.753.33
DO - 10.4028/www.scientific.net/KEM.753.33
M3 - Conference contribution
AN - SCOPUS:85028763045
SN - 9783035711363
T3 - Key Engineering Materials
SP - 33
EP - 38
BT - International Symposium on Advanced Material Research - ISAMR 2017
A2 - Kim, Dong Keon
PB - Trans Tech Publications Ltd
T2 - International Symposium on Advanced Material Research, ISAMR 2017
Y2 - 17 March 2017 through 19 March 2017
ER -