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Zhang J.,Taiyuan University of Technology | Ji G.,Taiyuan University of Technology | Wang X.,Taiyuan University of Technology | Zhang Z.,Taiyuan University of Technology | And 4 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2012

Microstructures and mechanical properties of AM60 magnesium alloy with Sm addition were investigated through OM, SEM XRD and DNS100 electronic universal testing machines. The results show that the addition of Sm can refine grains, change the morphology and the size of β-Mg 17Al 12 phase from continuous/discontinuous netlike or strip form to cobble or particulate form. The distribution also becomes homogeneous and dispersed, and obviously improves the microstructure. After Sm addition to the alloy, the dispersed, high-melting-point particles (mainly Al 2Sm phase) are formed. With increasing of Sm content, the tensile strength and elongation of AM60 magnesium alloy increase first and then decrease. With addition of 1.0wt% Sm, the tensile strength and elongation of the alloy reach the maximum 210 MPa and 6.9%, respectively. The tensile fracture mechanism of AM60 magnesium alloy is changed from cleavage fracture to quasi-cleavage fracture with toughness characteristic. © 2012, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.


Zhang J.,Taiyuan University of Technology | Ji G.,Taiyuan University of Technology | Qiu B.,Taiyuan University of Technology | Zhao G.,Taiyuan University of Technology | And 4 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2012

Microstructures and mechanical properties of AM60 magnesium alloy with Sm and Ti addition were investigated through OM, SEM, XRD and DNS100 electronic universal testing machines and the effect of Sm and Ti addition was analyzed. The results show that the alloy grains can be refined greatly by the proper addition of Sm or Ti and reduce the precipitation of β. There are some Al 3Ti phases formed after the addition of Ti. However, the β-Mg 17A1 12 phase of the AM60 alloy changes from discontinuous netlike form to cobble or particulate form and even dispersed after 1%Sm addition. Particle phase of Al 2Sm, Mg 41Sm 5 and spherical phase of Al 18Ti 2Mg 3 are formed when adding Sm and Ti together. The rod-shaped phases in the alloy dismiss or transform roundly and massive particles become smaller by the inoculation of Ti and subsequent T6 process. With addition of 1.0%Sm and 0.4%Ti, the tensile strength and elongation reach 226 MPa and 6.7%, elevated by 34.5% and 39.6% respectively; the heat tensile strength and elongation at 200°C reach 170 MPa and 10.4%, elevated by 53.2% and 82.5% respectively. T6 process can further enhance the mechanical properties of AM60 alloy. Copyright © 2012, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.

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