Extrudability of Mg-Al-Zn Alloys

Murai, Tsutomu; Matsuoka, Shin‐ichi; Miyamoto, Susumu; Oki, Yoshito

doi:10.4028/www.scientific.net/msf.419-422.349

Cited by 7 publications

(9 citation statements)

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“…These have been used to describe the extrusion performance of a number of aluminum alloys, [9][10][11][12][13][14] but the approach appears to have been applied to magnesium alloys only in a few cases. [15][16][17][18] Despite the infrequent use of the full limit diagram, the degree to which the maximum extrusion speed of the Mg-Al-Zn alloy series is raised by lowering the aluminum or zinc level has been quantified in a number of cases. [16,[18][19][20] As expected, lowering these alloying additions also comes at a cost to the mechanical performance of the product.…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17][18] Despite the infrequent use of the full limit diagram, the degree to which the maximum extrusion speed of the Mg-Al-Zn alloy series is raised by lowering the aluminum or zinc level has been quantified in a number of cases. [16,[18][19][20] As expected, lowering these alloying additions also comes at a cost to the mechanical performance of the product. [4] In contrast to this, it has been shown that manganese additions improve mechanical properties without significantly lowering the extrusion speed.…”

Section: Introductionmentioning

confidence: 99%

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Extrusion Limits of Magnesium Alloys

Atwell

Barnett

2007

Metall Mater Trans A

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Magnesium alloys are generally found to be slower to extrude than aluminum alloys; however, limited quantitative comparisons of the actual operating windows have been published. In this work, the extrusion limits are determined for a series of commercial magnesium alloys (M1, ZM21, AZ31, AZ61, and ZK60). These are compared with the limits established for aluminum alloy AA6063. The maximum extrusion speed of alloy M1 is shown to be similar to AA6063. Alloys ZM21, AZ31, ZK60, and AZ61 exhibit maximum extrusion speeds 44, 18, 4, and 3 pct, respectively, of the maximum measured for AA6063. For AZ31, the maximum extrusion speed is increased by 22 pct after homogenization and by 64 pct for repeat extrusions. The variation in the extrusion limits with changing alloy content is rationalized in terms of differences in the hot working flow stress and solidus temperature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extrusion Limits of Magnesium Alloys

Atwell

Barnett

2007

Metall Mater Trans A

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“…[1] Out of the wrought magnesium alloys, Mg-3Al-1Zn (AZ31) is considered to be the work-horse and considerable emphasis is being given to develop processing-microstructure-mechanical property correlations for this alloy. [2][3][4][5][6][7][8][9][10][11] Since magnesium alloys have limited ductility at room temperature, forming is generally done at elevated temperatures, the most common method being extrusion. [12][13][14][15] AZ31 alloy is commercially extruded at a temperature of about 300°C, [12] which results in a fine grained microstructure and a fiber texture with <10 1 0>direction parallel to the extrusion direction (ED).…”

mentioning

confidence: 99%

“…In addition, higher extrusion temperatures result in an increase in grain size. [9] The hot deformation behavior of AZ31 alloy is sensitive to the initial microstructure and the prior processing history, [2,5,9] and both the above changes in grain size and texture will influence the hot workability of the extruded product. The hot working behavior of Mg-Al-Zn alloys has been reviewed recently, [19] and the apparent activation energy estimated by different investigators has shown some variations and is generally higher than that for self-diffusion.…”

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confidence: 99%

Hot Deformation Mechanisms and Microstructural Control in High‐Temperature Extruded AZ31 Magnesium Alloy

Prasad

Rao

2007

Adv Eng Mater

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In recent years, magnesium alloys have attracted attention in view of their low density and high specific strength and are being considered for structural components in aerospace and automobile applications. [1] Out of the wrought magnesium alloys, Mg-3Al-1Zn (AZ31) is considered to be the work-horse and considerable emphasis is being given to develop processing-microstructure-mechanical property correlations for this alloy. [2][3][4][5][6][7][8][9][10][11] Since magnesium alloys have limited ductility at room temperature, forming is generally done at elevated temperatures, the most common method being extrusion. [12][13][14][15] AZ31 alloy is commercially extruded at a temperature of about 300°C, [12] which results in a fine grained microstructure and a fiber texture with <10 1 0>direction parallel to the extrusion direction (ED). [2,6] Deformation at higher temperatures would enhance the hot workability, even to the extent of resulting in superplasticity, [16][17][18] presumably due to extensive occurrence of pyramidal slip and dynamic recrystallization. In addition, higher extrusion temperatures result in an increase in grain size. [9] The hot deformation behavior of AZ31 alloy is sensitive to the initial microstructure and the prior processing history, [2,5,9] and both the above changes in grain size and texture will influence the hot workability of the extruded product. The hot working behavior of Mg-Al-Zn alloys has been reviewed recently, [19] and the apparent activation energy estimated by different investigators has shown some variations and is generally higher than that for self-diffusion. [20][21][22][23][24] The aim of the present investigation is to characterize the hot deformation behavior of AZ31 rod produced by high temperature extrusion (HTX) (450°C) with a view to evaluate the hot working mechanisms and microstructural development in the product. Such a study would assist in achieving microstructural control during the secondary-forming stage of component manufacture in this industrially important magnesium alloy. The hot deformation behavior is explored using the methods of kinetic analysis as well as processing maps. The former one is based on the standard kinetic rate equation relating the flow stress (r) to strain rate (_ e) and temperature (T), given by: [25] _ e Ar n expÀQ=RT (1) where A = constant, n = stress exponent, Q = activation energy, and R = gas constant. The rate-controlling mechanisms are identified on the basis of the activation parameters n and Q. The technique of processing maps is based on the dynamic materials model, the principles of which are described earlier. [26][27][28] Briefly, the work-piece undergoing hot deformation is considered to be a dissipator of power and the strain rate sensitivity (m) of flow stress is the factor that partitions power between deformation heat and microstructural changes. The efficiency of power dissipation occurring through microstructural changes during deformation is derived by comparing the non-linear power dissipation occurring instant...

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“…Magnesium alloys are crucial for bio-medical applications [1] in orthopedics, due to their possible use as biodegradable implants. The human body metabolism needs 250-300 mg, of Mg ions daily [2].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sintering Temperature on Mechanical Properties of Mg-Zr Alloy

al.¹

2017

IJMPERD

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Magnesium, Zirconium alloy is developed in three different sintering temperatures through powder metallurgy technique followed by hot extrusion in this work. The application of this material is for orthopedic implants.Magnesium alloy result shows improvement in density, hardness, tensile strength and minimized porosity on increasing sintering temperature. The surface characterization of the alloy is carried out through optical microscopy. The SEM (Scanning Electron Microscope) analysis of fractured surface of Mg alloy shows quasi-cleavage fracture.

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Extrudability of Mg-Al-Zn Alloys

Cited by 7 publications

References 0 publications

Extrusion Limits of Magnesium Alloys

Extrusion Limits of Magnesium Alloys

Hot Deformation Mechanisms and Microstructural Control in High‐Temperature Extruded AZ31 Magnesium Alloy

Effect of Sintering Temperature on Mechanical Properties of Mg-Zr Alloy

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