Microstructures and tensile properties of ECAE processed Mg-Al-Zn alloys.

雄, 吉田; 英明, 山田; 重晴, 鎌土; 陽, 小島

doi:10.2464/jilm.51.556

Cited by 12 publications

(9 citation statements)

References 19 publications

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“…Furthermore, in both texture (a) and (b), two types of orientations that are misaligned at 30 around the c-axis can be expected according to a previous study. 18) If the specimen having texture (a) is tensioned along the extrusion direction, easy basal slip would occur because maximum shear force occurs on the plane inclined at 45 to the tensile direction. As a result, both the tensile strength and 0.2% proof stress would be remarkably reduced.…”

Section: Texturementioning

confidence: 99%

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Effect of Microstructural Factors on Tensile Properties of an ECAE-Processed AZ31 Magnesium Alloy

et al. 2003

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Mg-3%Al-1%Zn (AZ31) alloy was subjected to ECAE (Equal Channel Angular Extrusion) processing under various processing conditions. Then tensile tests were carried out at room temperature to investigate the relationship between tensile properties and microstructural parameters that include grain size and the texture generated by ECAE processing. In 4-pass ECAE specimens processed at 523 K, tensile ductility is improved as a result of easy basal slip during tensile test along the extrusion direction, because such specimens have textures in which the basal plane is inclined at 45 to the extrusion direction. On the other hand, in the specimens processed at 573 K, 0.2% proof stress is higher than those of specimens processed at lower temperatures, but elongation is smaller. This is because of difficult basal slip caused by the textures in which the basal plane is oriented parallel to the extrusion direction. However, 8-pass specimens processed at 473 K and subsequently annealed, which have similar textures but different grain sizes (d), exhibit clear grain size dependencies of 0.2% proof stress ( 0:2 ) according to Hall-Petch relationship; 0:2 ¼ 30 þ 0:17d À1=2 . Therefore, crystallographic orientation has a profound effect on the tensile properties of AZ31 alloy, and grain size has a little effect.

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Section: Texturementioning

confidence: 99%

“…In a previous study, 18) ECAE processing 19,20) was applied to Mg-Al-Zn alloys as a method not only for grain refinement but also for texture control. As a result, a peculiar texture in which the basal plane is inclined at 45 to the extrusion direction was formed, and therefore, the ductility was improved significantly.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructural Factors on Tensile Properties of an ECAE-Processed AZ31 Magnesium Alloy

et al. 2003

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“…[8][9][10] Also, magnesium alloys with controlled texture have been reported to exhibit improved ductility. [11][12][13] Previous researches 14,15) show that in magnesium alloys processed by Equal Channel Angular Extrusion (ECAE) 16) using specimens that have a small diameter of about 15 mm, the grains are refined and a texture in which the basal plane is inclined at 45 to the extrusion direction is obtained. As a result, if tensile test is carried out such that the tensile direction is parallel to the extrusion direction, basal slip occurs easily and elongation is remarkably improved.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, if tensile test is carried out such that the tensile direction is parallel to the extrusion direction, basal slip occurs easily and elongation is remarkably improved. 14,15) Due to the limited sample size, mechanical properties were evaluated using tensile specimens that were extracted such that the tensile direction was parallel to the extrusion direction and only the central part of ECAE-processed samples could be utilized. However, in order to effectively use ECAE-processed materials to make industrial products, larger materials are required.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Tensile Properties of ECAE-Processed and Forged AZ31 Magnesium Alloy

et al. 2003

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In order to achieve same level of high strength and high ductility as 6061 aluminum forging alloy that is currently used for automobile applications, AZ31 magnesium alloy rod with a large diameter of 40 mm was subjected to ECAE-processing, and the microstructures and mechanical properties of the ECAE-processed specimens were investigated. Furthermore, automobile knuckle arm was produced by forging using the ECAE-processed material, and the mechanical properties of the forged product and their strain rate dependencies were investigated under impact tensile load conditions. 4pass-ECAE-processed specimen has fine and uniform microstructure and a texture whose basal planes are mainly parallel to the extrusion direction with some inclined at angles up to 45 to the extrusion direction. Therefore, they show high ductility even if the tensile direction is parallel to the extrusion direction. The knuckle arm forged using the ECAE-processed material exhibits high elongation even in the high strain rate region. Furthermore, the tensile strength, fracture elongation and absorption energy of the forged product increase with increasing strain rate and their values are higher than those of T6-treated 6061 aluminum forging alloy specified by JIS.

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“…Therefore, numerous studies are being carried out on new alloy development [1][2][3] and improvement of wrought alloys. [4][5][6] Presently, aluminum alloys are used in many parts of the vehicle, but magnesium alloys are only used in a few parts. However, suitable magnesium alloys have been developed for diecasting of lightweight automotive power train parts that will help to broaden the application of magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Porous Magnesium Alloys by Pulse Electric Current Sintering Process Using Machined Chips

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Magnesium based porous materials are made by Pulse-Electric-Current-Sintering (PECS) method using cut chips. Commercial ingots of AZ91D and AM60B alloys and extruded AZ31 alloy were selected as raw materials in order to change the amount of eutectic compounds and the range of semi-solid temperatures. Porous materials of various plateau stresses could be made by PECS process depending on pore ratio, alloy composition and sintering temperature. In well-joined parts of porous samples of AZ91D and AM60B alloy, Mg-Al system compounds crystallize, while the aluminum content at the joined part of AZ31 porous sample is concentrated. This means that the non-equilibrium solidified Mg-Al compound is preferentially remelted by rapid heating during PECS. Thus the difference in the microstructures of the joined parts is caused by the different aluminum contents of the alloys. The condition for making the well-joined porous materials using PECS process is to use alloys that have large amount of low melting compounds and large semi-solid temperature range. The plateau stresses of the porous materials investigated in this study are in the range from 1.3 to 37.3 MPa and pore ratio is the most important factor affecting plateau stress.

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Microstructures and tensile properties of ECAE processed Mg-Al-Zn alloys.

Cited by 12 publications

References 19 publications

Effect of Microstructural Factors on Tensile Properties of an ECAE-Processed AZ31 Magnesium Alloy

Effect of Microstructural Factors on Tensile Properties of an ECAE-Processed AZ31 Magnesium Alloy

Microstructures and Tensile Properties of ECAE-Processed and Forged AZ31 Magnesium Alloy

Fabrication of Porous Magnesium Alloys by Pulse Electric Current Sintering Process Using Machined Chips

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