Open AccessEFFECT OF Sr ADDITION ON THE MICROSTRUCTURE AND PROPERTIES OF THE A356 Al ALLOY
Author(s) -
Yan Wang,
Gaosheng Fu,
XU Yan-hua,
Wenbin Lai,
Hongling Chen
Publication year - 2021
Publication title -
materiali in tehnologije
Language(s) - English
Resource type - Journals
eISSN - 1580-3414
pISSN - 1580-2949
DOI - 10.17222/mit2020.038
Subject(s) - materials science , alloy , eutectic system , elongation , microstructure , ultimate tensile strength , casting , metallurgy
An effective way of integrating purification and modification is used for casting the A356 Al alloy. Self-generated inclusion-eliminating flux exhibits excellent purification in the alloy with an inclusion-removal rate of 74 %. The grains of eutectic silicon are fine or vermicular, and diffusely distributed in the A356 Al alloy at a 0.012 w/% Sr addition. The mechanical properties of the alloy are significantly improved, including a tensile strength of 208.5 MPa and an elongation of 17.5 %. As the Sr addition is increased, the comprehensive properties of the material are not improved. The Sr addition can be reduced to a certain degree during the modification of the melt after high purification. The addition of 0.012 w/% Sr is most preferable in the alloy.