Effect of Ni and Sr on the microstructure and tensile properties of the squeeze cast Al-Si-Cu alloy at elevated temperatures
Einfluss von Ni und Sr auf das Gefüge und die Zugfestigkeitseigenschaften einer Al-Si-Cu-Pressgieß-Legierung bei erhöhten Temperaturen
IF 1.2 4区 材料科学Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
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引用次数: 0
Abstract
The influence of the transition alloying element nickel and the alkaline earth element strontium on the microstructure and tensile properties of squeeze cast Al−Si-Cu alloy under as-cast condition at elevated temperature of 100 °C, 200 °C and 300 °C is investigated in comparison with the conventional Al−Si-Cu alloy (A380). Aluminum alloy A380 is alloyed and modified with 2 wt% additional nickel (Ni) and 0.02 wt% strontium (Sr). Squeeze casting is employed to cast the modified A380 under an applied pressure of 90 MPa. The results of tensile testing at the selected elevated temperatures indicate that the Ni and Sr containing A380 alloy exhibits a significantly improvement on tensile properties, specifically ultimate tensile strength and yield strength with 10 %-30 % increases. The as-cast microstructures of both the conventional and Ni and Sr-containing alloys are observed by an optical microscope and further analyzed with scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The presence of Ni-containing intermetallic phases with Ni addition, and the modified eutectic Si phase with refined morphologies due to the Sr addition should be responsible for the considerable enhancement on the as-cast strengths of the squeeze cast Ni- and Sr-containing alloy over those of the conventional A380 alloy.
期刊介绍:
Materialwissenschaft und Werkstofftechnik provides fundamental and practical information for those concerned with materials development, manufacture, and testing.
Both technical and economic aspects are taken into consideration in order to facilitate choice of the material that best suits the purpose at hand. Review articles summarize new developments and offer fresh insight into the various aspects of the discipline.
Recent results regarding material selection, use and testing are described in original articles, which also deal with failure treatment and investigation. Abstracts of new publications from other journals as well as lectures presented at meetings and reports about forthcoming events round off the journal.