Modification of Hypereutectic Al-20%Si Alloy by Neodymium

Wei Xi Shi; Cheng Wu Du; Guang Zhe Lv; Chang Wan Liu

doi:10.4028/www.scientific.net/AMR.1095.180

Paper Titles

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Manufacturing Technology Research of Magnesium Alloy Transmission Case
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Measurement of TTP Curves of 7050 Aluminum Alloy by Conductivity
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Micromechanics Analysis of Elastic Modulus of Alumina-Carbon Refractories
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Research on Heat Resistance of As-Cast Ferritic Nodular Iron
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Study on High-Temperature Mechanical Properties of SPHC Steel Produced by CSP Technology
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Study on Microstructure and Property of High Boron Alloyed Stainless Steel Composite Plate Containing Titanium
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Study on Multi-Alloy Ingots Produced Using Hot-Top DC Casting Approach
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1095Modification of Hypereutectic Al-20%Si Alloy by...

Modification of Hypereutectic Al-20%Si Alloy by Neodymium

Abstract:

The modification mechanism was studied by OM, SEM, XRD and Trace Element Analysis. The results of OM and SEM analysis show that pure Nd can effectively refine primary and eutectic silicon in hypereutectic Al-20%Si alloy. Morphology of primary silicon is transformed from pentalpha to block and the average grain size of primary silicon is reduced from 80~120μm to 20~50μm after modification. Trace Element Analysis results show that Nd can purity base metal and reduce impurity contents. XRD patterns show that no new phase formed after Nd modification. The results of mechanical properties test show that whole properties of modified sample are significantly improved. Tensile strength increases about 35.8% from 117 MPa to 148 MPa after modification, Elongation change increases about 193% from 0.56% to 1.64%. The improvement of mechanical properties should be attributed to fine primary Si phase and eutectic silicon phase and purification of base metal after modification.