Microstructure and Mechanical Property in Cast AZ91 Magnesium Alloy with Y Addition

Tatsuaki Sakamoto; Shu Chen Sun; Takuya Matsumoto; Kiyomichi Nakai; Sengo Kobayashi; Seiji Matsuda; Wei Tang; Gan Feng Tu

doi:10.4028/www.scientific.net/MSF.783-786.472

Paper Titles

Hot Forging of Cast Magnesium Alloy TX31 Using Semi-Closed Die and its Finite Element Simulation
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On the Bonding Strength of Mg-Mg and Mg-Al Material Compounds
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A New Model for Discontinuous and Continuous Precipitation in AZ91 Magnesium Alloy
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Age-Hardening Behavior of Mg-Al-Zn Alloys Produced by Sand Mold Casting
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Microstructure and Mechanical Property in Cast AZ91 Magnesium Alloy with Y Addition
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Method for the Depletion of the Basal Texture in Rolled AZ31 Magnesium Sheets
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Microstructure Evolution of Mg-10Gd-2Y-0.5Zn-0.3Zr Alloy during Isothermal Forging Process
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High Temperature Creep Behavior and Effects of Stacking Fault Energy in Mg-Y and Mg-Y-Zn Dilute Solid Solution Alloys
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Recrystallization of AZ31 Alloy
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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Microstructure and Mechanical Property in Cast...

Microstructure and Mechanical Property in Cast AZ91 Magnesium Alloy with Y Addition

Abstract:

Microstructures and Vickers microhardness in AZ91 magnesium alloys without and with 1mass%Y addition fabricated by casting were investigated. Vickers microhardness increases with adding 1%Y. Microstructure in AZ91 without Y addition was analyzed to contain mainly α-Mg and Mg₁₇Al₁₂ by X-ray diffraction. Microstructural observations with optical, scanning and transmission electron microscopes show that microstructure consists of α-Mg dendrite, non-equilibrium eutectic Mg₁₇Al₁₂ and lamellar Mg₁₇Al₁₂. The non-equilibrium eutectic Mg₁₇Al₁₂ exists between α-Mg dendrites. The lamellar Mg₁₇Al₁₂ forms near the edge of the α-Mg dendrite arm. The lamellar Mg₁₇Al₁₂ has Burgers orientation relationship for α-Mg matrix. It suggests that the lamellar Mg₁₇Al₁₂ precipitates from Al-supersaturated region within α-Mg dendrite. Addition of Y to AZ91 hardly changes dendrite arm spacing, but decreases a size of region, where longitudinal directions of primary dendrite arms are almost parallel or a single dendrite exists. Y-addition increases nucleation site for dendrite, namely makes the unidirectionally-solidified region fine, resulting in increase in hardness.

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Materials Science Forum (Volumes 783-786)

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472-477

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.783-786.472

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Online since:

May 2014

Authors:

Tatsuaki Sakamoto*, Shu Chen Sun, Takuya Matsumoto, Kiyomichi Nakai, Sengo Kobayashi, Seiji Matsuda, Wei Tang, Gan Feng Tu

Keywords:

Casting, Magnesium Alloy, Yttrium

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