Effect of Small Addition of Si on Superplastic Elongation at Room Temperature in Zn-Al Eutectoid Superplastic Alloy

Yuhei Kamiya; Masaki Ninomiya; Tokuteru Uesugi; Yorinobu Takigawa; Kenji Higashi

doi:10.4028/www.scientific.net/AMR.922.328

Paper Titles

Effect of Precipitation on Texture Evolution during Dynamic Recrystallization in Mg-Al-Sn Alloys
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Thermodynamic Modeling and Experimental Measurement of Precipitation Formation during Dynamic Recrystallization for Magnesium Alloys
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Tempering of Direct Quenched Low-Alloy Ultra-High-Strength Steel, Part I – Microstructure
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Effects of Ni and Co Additions to Filler Metals on Ag-Brazed Joints of Cemented Carbide and Martensitic Stainless Steel
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Effect of Small Addition of Si on Superplastic Elongation at Room Temperature in Zn-Al Eutectoid Superplastic Alloy
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Ultrasonic Spot Welding of Galvanized Steel Sheet
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The Age-Hardening Mechanism of Nanocrystalline Ni-P Alloys Synthesized by Electrodeposition
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Microstructural Evolution of AA5052 Alloy Sheets in High-Speed Rolling
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Strengthening and Toughening Mechanisms in Martensitic Steel
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 922Effect of Small Addition of Si on Superplastic...

Effect of Small Addition of Si on Superplastic Elongation at Room Temperature in Zn-Al Eutectoid Superplastic Alloy

Abstract:

Recent experimental data have revealed that a small amount of impurity can significantly influence the superplastic behavior in Zn-Al eutectoid superplastic alloy. However, the effect of Si content on the superplastic behavior in Zn-Al alloy has not been reported. In this study, the superplastic behavior at a room temperature of two grades of the Zn-Al eutectoid superplastic alloy was studied under identical conditions of grain size, temperature, and strain rate. These two grades were prepared from high-purity Zn, Al and Al-Si alloy using the same procedure but different Si impurity levels; Zn-Al-10Si and Zn-Al-1000Si contain 10 and 900 wt. ppm of Si, respectively. As a result of annealing treatments, an average grain size of 0.6 μm in both grades. To investigate the effects of Si content on superplastic properties, the tensile tests were performed at a room temperature of 298 K and a constant strain rate of 1×10^-3 s^-1. Microstructures before and after the tensile tests was observed using a scanning electron microscope. The experimental results show that the elongations decreased with increasing the Si content. In contrast, the flow stress of Zn-Al alloys was not affected by the Si content. On the microstructure observation of the two grades of the Zn-Al alloy before and after the tensile tests, cavities existed at grain boundaries and strain enhanced grain growth was observed.