Microstructures and mechanical properties of friction stir welds of 60% Cu–40% Zn copper alloy

Park, Hwa Soon; Kimura, Tsuyoshi; Murakami, Taichi; Nagano, Yasutaka; Nakata, Kohei; Ushio, Masao

doi:10.1016/j.msea.2003.11.030

Cited by 172 publications

(93 citation statements)

References 7 publications

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“…The FSP is an adaptation of friction stir welding (FSW) technology and has been applied to achieve localized microstructure modification in wrought and powder metallurgy materials as well as cast metals. [4][5][6][7][8][9][10][11] For example, in wrought AA7075, FSP has been used to generate highly refined grains that support high-strain-rate superplasticity. [4,5,6] The technique has also been used to bond surface layers of composite material, 50 to 200 m in thickness and containing uniformly distributed SiC particles, to an aluminum alloy substrate.…”

Section: Friction Stir Processing (Fsp) Is a Solid-statementioning

confidence: 99%

The influence of friction stir processing parameters on microstructure of as-cast NiAl bronze

Oh-ishi

McNelley

2005

Metall Mater Trans A

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The influence of friction stir processing (FSP) parameters on the evolution of microstructure in an equilibrium-cooled, as-cast NiAl bronze (NAB) material was evaluated by optical microscopy (OM) and transmission electron microscopy (TEM) methods. A threaded pin tool was employed and tool rotation and traversing rates were varied in order to examine the spatial variation of stir zone microstructures in relation to FSP parameters. For processing at low rotation and traversing rates, the microstructure throughout the stir zone consists of elongated and banded grains of the primary ␣ and transformation products of the ␤ phase. Such microstructures reflect severe deformation at temperatures up to ϳ900°C in the ␣ ϩ ␤ two-phase region for this NAB material. Increasing rotation and traversing rates, coarse Widmanstätten ␣ near the surface in contact with the tool became apparent. The appearance of this constituent reflects nearly complete transformation to ␤ during FSP with peak temperatures of ϳ1000°C. Also, complex stir zone flow patterns, often referred to as onion ring structures, become distinct in the mid regions of the stir zones as rotation and traversing rates increase. Schematic representations illustrating the effect of FSP parameters on thermal cycles at various locations in stir zones were prepared based on microstructure observations. Thus, processing at higher rotation and traversing rates results in higher peak temperatures near the surface in contact with the tool but also in steeper temperature gradients when compared to lower rotation and traversing rates.

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Section: Friction Stir Processing (Fsp) Is a Solid-statementioning

confidence: 99%

The influence of friction stir processing parameters on microstructure of as-cast NiAl bronze

Oh-ishi

McNelley

2005

Metall Mater Trans A

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“…Over the last decade, friction stir welding (FSW) has offered excellent welding quality to the joining of many alloys such as aluminum alloys, 1,2) magnesium alloys, 3) Cu alloys, 4) and steel alloys. 5,6) FSW is a solid state welding process in which a high temperature deformation is induced into base materials by a rotating tool composed of two parts called shoulder and probe.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Friction Stir Welded Dissimilar Aluminum Joints of AA2024-T3 and AA7075-T6

Khodir

Shibayanagi

2007

Mater. Trans.

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Dissimilar aluminum alloys such as 2024-T3 and 7075-T6 plates 3 mm thickness were friction stir butt welded. The welding was carried out at a constant welding speed of 100 mm/min and rotation speeds of 400, 800, 1200, 1600 and 2000 min À1 . Effects of rotation speeds and fixed location of two alloys on microstructures especially the homogeneity of elemental distribution in the stir zone (SZ), hardness distributions, and tensile properties of the joints were investigated. The homogeneity of constituents of the two alloys in the SZ was analyzed by a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectroscopy (EDS).At the lowest rotation speed of 400 min À1 there was no mixing of two alloys in the SZ and a border between them was observed regardless of the fixed location. Increase of rotation speed more than 400 min À1 brought about a mixed structure likewise onion ring with periodic change of equiaxed grain size and heterogeneous distribution of alloying elements in the SZ. At 2000 min À1 of rotation speed the SZ mainly composed of the material fixed on the advancing side. The hardness increased in the zones occupied by 2024-T3 Al alloy and fluctuations took place in the SZ due to the onion ring at the higher rotation speeds till 1600 min À1 . At 2000 min À1 of rotation speed the hardness of SZ mainly depend on the material fixed on the advancing side. Hardness minima was in the heat affected zone (HAZ) on the side of AA2024-T3 Al alloy and the values slightly increased as the rotation speed increased. In the case of transverse tensile test, defect-free joints were fractured at the HAZ on 2024-T3 side and a maximum tensile strength of the joints was achieved at 1200 min À1 of rotation speed when 2024-T3 Al alloy was located on the advancing side. On the other hand, the tensile properties of SZ in the longitudinal direction showed higher values when 7075 Al alloy was located on the advancing side.

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“…Friction stir processing has been employedt oh omogenize and refine microstructures in both cast and wrought metals, includinga lloys of Al [5][6][7][8][9][10] and Mg [11,12] and higher melting alloys of Cu, [13] Fe, [14] and Ti. [15] BenefitsofFSP in cast metals include elimination of porosity and local conversion of cast microstructures to awrought condition, with enhanced near-surface properties.S ignificantly improved strength/ductilityc ombinations [16,17] and high-strain-rate superplasticity [3][4][5][6][7]18] havebeen achieved by FSP of wrought materials.…”

Section: Introductionmentioning

confidence: 99%

A microtexture investigation of recrystallization during friction stir processing of as-cast NiAl bronze

Oh-ishi

Zhilyaev

McNelley

2006

Metall Mater Trans A

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Microstructures and mechanical properties of friction stir welds of 60% Cu–40% Zn copper alloy

Cited by 172 publications

References 7 publications

The influence of friction stir processing parameters on microstructure of as-cast NiAl bronze

The influence of friction stir processing parameters on microstructure of as-cast NiAl bronze

Microstructure and Mechanical Properties of Friction Stir Welded Dissimilar Aluminum Joints of AA2024-T3 and AA7075-T6

A microtexture investigation of recrystallization during friction stir processing of as-cast NiAl bronze

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