Crystallographic Orientation Relationship between Discontinuous Precipitates and the Matrix in AM-Series Alloys

Watanabe, Katsumi; Matsuda, Kenji; Kawabata, Tokimasa; Ikeno, Susumu

doi:10.4028/www.scientific.net/AMR.409.383

Paper Titles

Evolution of as-Cast Microstructure of Mg-Al Alloys with Solute Content and Cooling Rate
p.362

Electrochemical Behavior of Mg-6mass%Al Alloy Corroded in Na₂SO₄ and NaCl Solutions
p.368

Effect of Grain Size on Microstructure and Aging Behavior in AM60 Magnesium Alloy
p.373

Effect of Al and Mn Contents on Microstructure in AM-Series Magnesium Alloys
p.379

Crystallographic Orientation Relationship between Discontinuous Precipitates and the Matrix in AM-Series Alloys
p.383

Morphological and Crystallographic Characterizations of the Ca-Mg-Zn Intermetallics Appearing in Ternary Diffusion Couples
p.387

Effect of Dimensional Variation on Induction Process Parameters Using 2D Simulation
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Numerical Simulation of Solidification Behavior and Grain Structure for Multi-Crystalline Silicon Casting and its Experimental Verification
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Simulation of Phase Transformation by Analysis of First Derivative of Dilatation Using Avrami Equation during Continuous Cooling in Low Carbon Steels
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HomeAdvanced Materials ResearchTHERMEC 2011 SupplementCrystallographic Orientation Relationship between...

Crystallographic Orientation Relationship between Discontinuous Precipitates and the Matrix in AM-Series Alloys

Abstract:

Magnesium alloys have received considerable attention because of their lightweight and recyclability. AM-series and AZ-series Mg-Al alloys have been used for industrial products widely, particularly for AM-series alloys because of better toughness and impact absorption properties than AZ-series alloys. The Mg₁₇Al₁₂ intermetallic compound is the only precipitate formed during ageing after the solution heart treatment. Discontinuous precipitates exist in grain boundary randomly, and continuous precipitates exist in the matrix. However, there is few report about the orientation relationship between the discontinuous precipitates and the matrix. The purpose of this study is to investigate the orientation relationship between the discontinuous precipitates and the matrix of AM-series magnesium alloys. Hardness measurement, SEM observation, the electron backscattered diffraction (EBSD) techniques were preformed in order to understand the relationship between the discontinuous precipitate and crystallographic orientation of grains in AM-series magnesium alloy. TEM samples with discontinuous precipitates were prepared using the focused ion beam (FIB). And TEM observation was performed to investigate the discontinuous precipitates and crystallographic orientation in the matrix.

Info:

Periodical:

Advanced Materials Research (Volume 409)

Main Theme:

THERMEC 2011 Supplement

Edited by:

T. Chandra, M. Ionescu and D. Mantovani

Pages:

383-386

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.409.383

Citation:

K. Watanabe et al., "Crystallographic Orientation Relationship between Discontinuous Precipitates and the Matrix in AM-Series Alloys", Advanced Materials Research, Vol. 409, pp. 383-386, 2012

Online since:

November 2011

Authors:

Katsumi Watanabe, Kenji Matsuda, Tokimasa Kawabata, Susumu Ikeno

Keywords:

Aging, Discontinuous Precipitates, FIB, Mg-Al Alloy, Microstructure, SEM, TEM

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Paper TitlePages

Rheocasting of Al-Cu Alloy A201 with Different Silver Contents

Authors: E.P. Masuku, Gonasagren Govender, L. Ivanchev, Heinrich Möller

Abstract: Rheocasting of alloys A206 and A201 was investigated in this study. Conical bars with different silver contents were produced using CSIR rheoprocess technology, together with high pressure die casting. The results showed that addition of Ag to alloy A206 increased the mechanical properties of the alloy. However, the addition of Ag also resulted in Cu-rich phases to precipitate at the grain boundaries of the as-cast material. The solution treatment used in this study was unable to dissolve all of this phase, especially in the 1.12%Ag-containing alloy. This resulted in slightly decreased mechanical properties compared to the 0.63%Ag-containing alloy. The T6 mechanical properties (strength and elongation) obtained in this study for rheocast A206 and A201 are better than those reported for permanent mould castings of alloy A206 and A201.

151

Precipitate Behavior and Microstructure Characterization of An Al-Zn-Mg-Cu Alloy Prepared by Spray Forming Process

Authors: Bao Hong Zhu, Bai Qing Xiong, Yon Gan Zhang, Udo Fritsching, Ji Shan Zhang, Feng Wang, Zhi Hui Li, Hong Wei Liu

Abstract: A high Zn content Al-Zn-Mg-Cu alloy was prepared by spray forming process and the precipitate behavior and microstructure of the extruded alloy were also investigated. The precipitate sequence of the spray-formed alloy could be described as “α-solid solution → GPI zone → GPII zone (also called Metastable ′ )→ Stable  (MgZn2)” during artificial ageing treatment. In the early stage of artificial ageing treatment, the GPI zone was the main strengthening phase and kept coherent relationship with the matrix. With the increasing of ageing time, ′ phase dominate strengthening phase and kept semi-coherent relationship with the matrix. With the further increasing of ageing time,  phase took the place of ′ phase, and dominated the strengthening phase in the alloy. The grain size of the spray deposit is finer than that of cast alloys. The ultimate tensile strength of the alloy is over 810MPa in peak ageing condition.

481

Comparison of Different Content of Cd and Sb Element on the Microstructure, Mechanical Properties of As-Cast AZ31 Magnesium Alloy

Authors: Xiao Ping Luo, Lan Ting Xia, Ming Gang Zhang

Abstract: The effect of Cd and Sb addition on the microstructural and mechanical properties of as-cast AZ31 alloys was investigated and compared. The results indicate that the difference of Sb and Cd in the microstructure and mechanical properties of as-cast AZ31 magnesium alloy is significant. Addition of 0.15%Sb (mass fraction) to AZ31 alloy can refine the matrix and β-Mg₁₇Al₁₂ phase but not form a new phase Mg₃Sb₂. Oppositely, by addition of 0.3-0.7% Cd to AZ31 alloy, Cd was dissolved into the AZ31 alloy, the phase composition did not change but was refined also. Accordingly, the Cd-refined AZ31 alloy exhibits higher tensile and impact toughness and Brinell hardness properties than the Sb- refined one. The difference of Sb and Cd in the mechanical properties is possibly related to the solid solution of Cd into the matrix and formation of Mg₃Sb₂ which has the same close-packed hexagonal structure as α-Mg.

197

DSC and TEM Study of Al-Cu-Mg-Ag Alloy Ageing at Low and Elevated Temperature

Authors: Hong Wei Liu, Yon Gan Zhang, Jian Bo Zhang, Bao Hong Zhu, Feng Wang, Zhi Hui Li, Xi Wu Li, Bai Qing Xiong

Abstract: Microstructural characterization of Al-Cu-Mg-Ag alloy ageing at low and elevated temperature were investigated by differential scanning calorimeter (DSC) and transmission electron microscopy (TEM). The results show that the precipitation sequence is significantly influenced by the ageing temperature. With prolonging of ageing at 65°C, G.P. zones on the plane of {100}α separates out with no precipitation of Ω phase. After 10h ageing at 160°C,the phase of Ω separates out and dominant the microstructure, while a small quantity of θ′separates out as well.

1225

The Influence of Various Etchants on the Quantitative Analysis of Microstructure of Mg-Nd Alloy

Authors: Michał Stopyra, Andrzej Kiełbus

Abstract: The paper presents the results of the influence of various etchants on the quantitative analysis of microstructure of Mg-Nd master alloy. The methodology of quantitative analysis of these alloys’ microstructure were also presented. Qualitative analysis were done using light and scanning electron microscopes, chemical composition was investigated using EDS method. Seven types of etchants were used. Having chosen suitable images, quantitative analysis were done using Met-Ilo program. Comparison of results showed that chosen etchants didn’t make the significant influence on the quantitative analysis results of the microstructure, despite visible dissimilarities.

192