Journal ArticleDOI
Nanoscale amorphous “band-like” structure induced by friction stir processing in Zr55Cu30Al10Ni5 bulk metallic glass
Junpei Kobata,Yorinobu Takigawa,Sung Wook Chung,Hiroshi Tsuda,Hisamichi Kimura,Kenji Higashi +5 more
TLDR
In this article, the microstructure in the friction zone (FZ) exhibited an amorphous band-like structure with widths of 10-45nm and a small number of nanoscale crystalline particles were observed along the "band-like" structure.About:
This article is published in Materials Letters.The article was published on 2007-07-01. It has received 18 citations till now. The article focuses on the topics: Amorphous solid & Nanostructure.read more
Citations
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Journal ArticleDOI
Friction Stir Processing of Particle Reinforced Composite Materials
TL;DR: In this article, a review of friction stir processing (FSP) technology and its application for microstructure modification of particle reinforced composite materials is provided. But the main focus of FSP was on aluminum based alloys and composites.
Journal ArticleDOI
Electrochemical and in vitro behavior of the nanosized composites of Ti-6Al-4V and TiO2 fabricated by friction stir process
Chengjian Zhang,Zihao Ding,Lechun Xie,Lai-Chang Zhang,Laizhi Wu,Yuanfei Fu,Liqiang Wang,Weijie Lu +7 more
TL;DR: In this article, the friction stir processing (FSP) was applied to fabricate a nanosized composite layer of TiO2 and Ti-6Al-4V.
Journal ArticleDOI
Friction stir welding of Zr55Cu30Al10Ni5 bulk metallic glass to Al–Zn–Mg–Cu alloy
TL;DR: In this article, bulk metallic glass (BMG) 1.7 mm thick and Al-Zn-Mg-Cu alloy plates were successfully joined by friction stir welding (FSW), producing defect-free BMG-Al joints.
Journal ArticleDOI
Thermomechanical Grain Refinement in AA6082-T6 Thin Plates under Bobbin Friction Stir Welding
Abstract: Bobbin friction stir welding (BFSW), with its fully penetrated pin and double-sided shoulder, can provide high rates of heat generation. This produces solid-state thermo-mechanical grain refinement. In this paper, the microstructure evolution of the welded joints of AA6082-T6 obtained using BFSW process was investigated with a focus on grain refinement. Two sheets of the AA6082-T6 alloy were butt-welded with a fixed-gap bobbin tool. The microstructure at a mid-weld transverse cross-section was evaluated using optical microscopy and electron backscatter diffraction (EBSD). Significant grain refinement was observed, with a decrease in grain size from 100 μm in directional columnar grain morphology of the base metal, to an ultrafine size—less than 10 μm—for the equiaxed grains in the stirring zone. The EBSD results showed that with BFSW processing, secondary phase precipitation patterns were produced that are distinct from the primary artificial age-hardening precipitates created by the T6 tempering cycle. The severe plastic deformation and heat generation appear to accelerate dynamic recrystallization and precipitation during the BFSW process. The microstructural studies confirmed that the BFSW process can provide a highly efficient thermodynamically activated grain refinement in the solid-state without requiring additional processes such as heat treatment or external means of grain refinement.
Journal ArticleDOI
Structural assessment of nanocomposites.
TL;DR: Assessment of the interface structures of nanocomposite materials using surface characterization techniques and mechanical damage models is discussed and applications of these methods for analysis of structures and compositions of typical Nanocomposites are introduced.
References
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Journal ArticleDOI
Stabilization of metallic supercooled liquid and bulk amorphous alloys
TL;DR: In this article, the authors investigated the stabilization properties of the supercooled liquid for a number of alloys in the Mg-, lanthanide-, Zr-, Ti-, Fe-, Co-, Pd-Cu- and Ni-based systems.
Journal ArticleDOI
Ductile bulk metallic glass.
Jan Schroers,William L. Johnson +1 more
TL;DR: Experimental evidence of pronounced global plasticity measured in monolithic Pt57.5 bulk metallic glass under both bending and unconfined compression loading conditions and the origin of the observed large global ductility and very high fracture toughness is reported.
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"Work-Hardenable" ductile bulk metallic glass.
Jayanta Das,Jayanta Das,Mei Bo Tang,Ki Buem Kim,Ralf Theissmann,F. Baier,Weihua Wang,Jürgen Eckert,Jürgen Eckert +8 more
TL;DR: The "work-hardening" capability and ductility of this class of metallic glass is attributed to a unique structure correlated with atomic-scale inhomogeneity, leading to an inherent capability of extensive shear band formation, interactions, and multiplication of shear bands.
Journal ArticleDOI
Difference in compressive and tensile fracture mechanisms of Zr59CU20Al10Ni8Ti3 bulk metallic glass
TL;DR: In this article, the authors investigated the fracture behavior of a Zr59Cu20Al10Ni8Ti3 bulk metallic glass under compressive and tensile deformation, and found that the fracture is mainly localized on one major shear band and the compressive fracture angle between the stress axis and the fracture plane is 43degrees.
Journal ArticleDOI
High Strain Rate Superplasticity in a Friction Stir Processed 7075 Al Alloy
TL;DR: In this article, the authors reported the first results using friction stir processing (FSP) for aluminum alloys and showed that FSP of a commercial 7075 Al alloy resulted in significant enhancement of superplastic properties.