Influence of additional Mn and Cu contents on mechanical properties of Al-Zn-Mg ternary based alloys

広朗, 清水; 光造, 長村; 大樹, 足立; 潤, 楠井; 健, 菊地

doi:10.2464/jilm.54.2

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…By TEM/EDX analysis, the average composition of the Q phase is determined to be about 78.8Al-12Mn-8Cu-1.2Zn in at%. The Q phase dispersed in these alloys contains less Zn than that in Al-Zn-Mg-Cu-Mn alloys, which contains 4 at% Zn [2]. Thus, the matrix contains more Zn (~ 1.6 at%) than expected.…”

Section: Aluminium Alloys 2006 -Icaa10mentioning

confidence: 80%

“…The rod-like Mn intermetallic phase, which appears as white particles in the image, is aligned in the extrusion direction. This is assumed to be the Q phase, which has been reported to precipitate in P/M Al-Zn-Mg-Cu-Mn alloys [2]. Most of the Q phase particles are fine and about 500 nm in length.…”

Section: Aluminium Alloys 2006 -Icaa10mentioning

confidence: 99%

“…In the P/M Al-Zn-Mg-Cu-Mn alloy, with 4 mass% Mn added in supersaturation, a high-density dispersion of the rod-like Al-Mn-Cu-Zn quaternary intermetallic phase (Q phase) is formed [2]. Since this phase can be dispersed more finely than the binary phase Al 6 Mn, it is possible to strengthen the alloy without a large reduction in ductility.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties of Dispersion-Hardened P/M Al-Mn-Cu-Mg-Zn Alloys at Elevated Temperature

Adachi

Osamura

Kusui

2006

MSF

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In order to improve the high-temperature strength of an Al-Cu-Mg alloy, Mn was added at supersaturation to form a high-density dispersion of an intermetallic phase. In the P/M Al-3.6Mn- 6.4Cu-3.6Zn-1.7Mg alloy (mass%), rod-like Al-Mn-Cu-Zn quaternary intermetallic phases (Q phase) several hundred nanometers in length were dispersed in the matrix. The chemical composition of the Q phase was determined by TEM/EDX to be 78.8Al-12Mn-8Cu-1.2Zn (at%). The crystal system, space group, and lattice parameters of the unit cell were identified to be orthorhombic, Cmcm and a = 0.76, b = 2.11, c = 1.25 nm, respectively, by Rietveld analysis. Since the matrix of the alloy obtained was of the Al-Cu-Mg-(Zn) system, age-hardening occurred by formation of a GPB zone at room temperature and 448 K. At the peak level of age-hardening at room temperature, the tensile strength at room temperature was 704 MPa, and the elongations were 8.0%. The high temperature strengths at 523 and 573 K were 319 and 141 MPa, respectively, and the elongations were 17 and 34%, respectively.

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Section: Aluminium Alloys 2006 -Icaa10mentioning

confidence: 80%

Section: Aluminium Alloys 2006 -Icaa10mentioning

confidence: 99%

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Mechanical Properties of Dispersion-Hardened P/M Al-Mn-Cu-Mg-Zn Alloys at Elevated Temperature

Adachi

Osamura

Kusui

2006

MSF

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“…Super high strength Al-Zn-Mg-Cu alloys were developed using rapidly solidified powder metallurgy (RS-P/M) by hot extruding the RS powder produced by the atomization method. [1,2,3] These alloys are called Mesoalite. The tensile strength of Meso10 whose chemical composition was Al-9.5Zn3Mg-1.5Cu-4Mn-0.04Ag (mass%) was 790 MPa.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mn Intermetallic Particle on Microstructure Development of P/M Al-Zn-Mg-Cu-Mn Alloy

Morimoto

Adachi

Osamura

et al. 2006

MSF

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The Mesoalite alloy is formed using rapidly solidified powder metallurgy (RS-P/M) by hot extruding the RS powder produced by the atomization method. Meso20 is a Mesoalite alloy with a chemical composition of Al-9.5Zn3Mg-1.5Cu-4Mn-0.04Ag (mass%). Meso20 contains fine grains and precipitated intermetallic Mn compounds, and has a tensile strength of 910 MPa. During hot extrusion, dynamic recrystallization occurs and the fine grains develop. During heat treatment of Meso20, rod-like and granular Mn intermetallic compounds precipitate. The rod-like compounds are about 1 Ìm in length and the granular compounds are about 1 Ìm in diameter. X-ray diffraction measurement, transmission electron microscopy and energy dispersive X-ray (TEM/EDX) analysis and Rietveld analysis revealed the chemical composition of the granular and rod-like Mn intermetallic precipitates to be 86.5Al-10.9Mn-0.4Cu-0.9Zn-1.3Mg and 80.5Al - 10.3Mn-4.2Cu-2.5Zn-2.5Mg (mass%), respectively. The granular and rod-like compounds were identified as the Al6Mn and Q phases, respectively, with both belonging to the space group Cmcm. The lattice constants of Al6Mn were a=0.754 nm, b=0.648 nm c=0.855 nm and those of the Q phase were a=0.765 nm b=2.34 nm c=1.25 nm. Meso10, with a chemical composition of Al-9.5Zn-3Mg-1.5Cu-0.04Ag (mass%), contains no Mn and does not have fine grains, but rather coarse fibrous grains elongated along the extrusion direction. Thus the Mn intermetallic precipitates in Meso20 clearly affect the formation of fine grains. Microstructure development was studied during hot extrusion by observation using high resolution Electron Back Scattering Pattern method. Fine grains were found to develop in areas, which were relatively abundant in granular Mn intermetallic precipitates.

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“…[5][6][7] The composition of Meso10, a typical mesoalite alloy, is Al-9.5Zn-3Mg-1.5Cu-0.04Ag in mass%. The tensile strength and elongation of this alloy are 785 MPa and 8.7%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effect of Zr Addition on Dynamic Recrystallization during Hot Extrusion in Al Alloys

et al. 2005

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The presence of Al 3 Zr precipitates promotes continuous dynamic recrystallization in Al-Zn-Mg alloys during hot extrusion, resulting in a fine-grained structure. The mechanism for this phenomenon was investigated by observing the change in microstructure under hot extrusion using high resolution EBSP. In the rear of the extrusion die mouth, grain boundary mobility is low since the flow stress is comparatively low and grain boundary migration is inhibited by Al 3 Zr particles. Thus, in order to reduce the deformation-induced high dislocation density, continuous dynamic recrystallization occurs, which does not involve long-range grain boundary migration, resulting in a finer-grained structure. The flow stress, and hence, the mobility of the grain boundary increase near the die mouth. This promotes long-range grain boundary migration, which reduces the dislocation density. Continuous dynamic recrystallization is not observed under these conditions. Since Al 3 Zr precipitates inhibit long-range grain boundary migration, increase of the Al 3 Zr precipitate content expands the region where continuous dynamic recrystallization occurs towards the die mouth, resulting in a finer-grained structure.

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Influence of additional Mn and Cu contents on mechanical properties of Al-Zn-Mg ternary based alloys

Cited by 7 publications

References 6 publications

Mechanical Properties of Dispersion-Hardened P/M Al-Mn-Cu-Mg-Zn Alloys at Elevated Temperature

Mechanical Properties of Dispersion-Hardened P/M Al-Mn-Cu-Mg-Zn Alloys at Elevated Temperature

Effect of Mn Intermetallic Particle on Microstructure Development of P/M Al-Zn-Mg-Cu-Mn Alloy

Effect of Zr Addition on Dynamic Recrystallization during Hot Extrusion in Al Alloys

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