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Microstructure and mechanical properties of gadolinium-and misch metal-added Mg-Al alloy

Rare Metals 2022年第9期41卷 3205-3213页

作者： Lavish Kumar Singh Prince Joseph Amirthalingam Srinivasan Uma Thanu Subramonia Pillai bellambettu chandrasekhara pai Department of Metallurgical and Materials Engineering Indian Institute of Technology KharagpurKharagpur721301India Materials Science and Technology Division National Institute for Interdisciplinary Science and TechnologyTrivandrum695001India

The study investigates the effects of individual and combined additions of gadolinium(Gd)and misch metal(MM)on the microstructure and mechanical properties of Mg-4Al and Mg-9Al *** results show that the additions significantly alter the microstructure and grain size of the base ***-4Al based alloys have globular morphology,whereas Mg-9Al based alloys have dendritic *** addition of alloying elements,Gd and MM,introduces rectangular-shaped Al_(2)Gd phase and needle-shaped Al_(11)RE_(3) phase,*** best mechanical properties at room temperature are shown by Mg-9Al-2Gd alloy with tensile strength and elongation of 214 MPa and 6.0%,respectively,whereas Mg-4Al-2Gd alloy exhibits the best properties at elevated temperature(150℃)with tensile strength and elongation of 172 MPa and 14.0%,*** study also reports the microhardness value of different phases along with the cast *** Mg_(17)Al_(12) phase shows the highest hardness(VHN 92)followed by lamellar Mg17Al12(VHN 83)andα-Mg matrix(VHN 68).

关键词： Rare earth Gadolinium Alloying Microstructure Mechanical properties

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Effects of gadolinium addition on the microstructure and mechanical properties of Mg–9Al alloy

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International Journal of Minerals,Metallurgy and Materials 2017年第8期24卷 901-908页

作者： Lavish Kumar Singh Alok Bhadauria Amirthalingam Srinivasan Uma Thanu Subramonia Pillai bellambettu chandrasekhara pai Department of Metallurgical and Materials Engineering Indian Institute of Technology Kharagpur Materials Science and Technology Division National Institute for Interdisciplinary Science and Technology

This research aims to study the significance of Gd addition(0wt%–2wt%) on the microstructure and mechanical properties of Mg–9Al alloy. The effect of Gd addition on the microstructure was investigated via X-ray diffraction(XRD), optical microscopy, scanning electron microscopy(SEM), and transmission electron microscopy(TEM). The Mg–9Al alloy contained two phases, α-Mg and β-Mg_(17)Al_(12). Alloying with Gd led to the emergence of a new rectangular-shaped phase, Al_2Gd. The grain size also decreased marginally upon Gd addition. The ultimate tensile strength and microhardness of Mg–9Al alloy increased by 23% and 19%, respectively, upon 1.5wt% Gd addition. We observed that, although Mg–9Al–2.0Gd alloy exhibited the smallest grain size(181 μm) and the highest dislocation density(5.1 × 10^(10) m^(-2)) among the investigated compositions, the Mg–9Al–1.5Gd alloy displayed the best mechanical properties. This anomalous behavior was observed because the Al_2Gd phase was uniformly distributed and present in abundance in Mg–9Al–1.5Gd alloy, whereas it was coarsened and asymmetrically conglomerated in Mg–9Al–2.0Gd.

关键词： magnesium rare earth alloying gadolinium microstructure mechanical properties

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