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Research Papers

Friction Stir Welding of Bulk Metallic Glass Vitreloy 106a

[+] Author and Article Information
Xiaoqian Ma

Department of Materials
and Metallurgical Engineering,
South Dakota School of Mines and Technology,
501 E. Saint Joseph Street,
Rapid City, SD 57701
e-mail: Xiaoqian.Ma@mines.sdsmt.edu

Stanley M. Howard

Department of Materials
and Metallurgical Engineering,
South Dakota School of Mines and Technology,
501 E. Saint Joseph Street,
Rapid City, SD 57701
e-mail: Stanley.Howard@sdsmt.edu

Bharat K. Jasthi

Department of Materials
and Metallurgical Engineering,
South Dakota School of Mines and Technology,
501 E. Saint Joseph Street,
Rapid City, SD 57701
e-mail: Bharat.Jasthi@sdsmt.edu

1Corresponding author

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received December 27, 2013; final manuscript received June 25, 2014; published online August 6, 2014. Assoc. Editor: Wayne Cai.

J. Manuf. Sci. Eng 136(5), 051012 (Aug 06, 2014) (7 pages) Paper No: MANU-13-1438; doi: 10.1115/1.4027941 History: Received December 27, 2013; Revised June 25, 2014

A Zr58.5Nb2.8Cu15.6Ni12.8Al10.3 (Vitreloy 106a) bulk metallic glass (BMG) was successfully welded by friction stir welding (FSW) with a fixed polycrystalline cubic boron nitride (PCBN) pin tool below its crystallization temperature. The microstructure was analyzed by X-ray diffraction (XRD) to evaluate the crystallization of the weld. The reduced radial distribution function (RDF), short-range order (SRO) domain size, and atomic pair distribution function (PDF) were analyzed to evaluate the effect of FSW at atomic scale. As a result, the SRO domain size was reduced for the weld surface, while increased for the weld nugget.

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Figures

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Fig. 1

Schematic of a typical butt joint being created by FSW

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Fig. 2

Casting furnace and experimental setup for the preparation of Vitreloy 106a BMG

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Fig. 3

Experimental setup showing Vitreloy 106a embedded in copper plate and the thermocouple locations

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Fig. 4

FSW experimental setup showing: (a) liquid argon quenching setup during welding and (b) FSW machine and polyethylene film used to create argon atmosphere during welding

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Fig. 5

Schematic showing the four locations on the friction stir weld where XRD was performed

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Fig. 6

Schematic illustration of a density function for an amorphous solid

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Fig. 7

Schematic illustration of RDF showing the position of: r0-nearest atoms' average distance and rs-next-nearest atom's average distance

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Fig. 8

FSW process forces showing X and Z forces as a function of welding distance

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Fig. 9

Macrograph showing the cross-sectional view of friction stir weld Vitreloy 106a

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Fig. 10

Comparison of parent and friction stir welded Vitreloy 106a normalized XRD spectra showing the amorphous structure

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Fig. 11

Reduced RDFs showing the SRO for: (a) parent metal, (b) weld surface, (c) advancing side HAZ, (d) weld nugget, and (e) retreating side HAZ

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Fig. 12

PDF indicating the average distance to the nearest atom for (a) parent metal, (b) weld surface, (c) advancing side HAZ, (d) weld nugget, and (e) retreating side HAZ

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Fig. 13

Temperature profiles as a function of time showing the maximum temperatures recorded at various stages of welding

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