Temperature, strain rate and reinforcement volume fraction dependence of plastic deformation in metallic glass matrix composites

Fu, Xiaoling; Li, Y.; Schuh, Christopher A.

doi:10.1016/j.actamat.2007.01.009

Cited by 57 publications

(38 citation statements)

References 46 publications

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“…For the SAM2Â5-630 (Figure 3a), there are obvious radial cracks extending from the corners of the indent, which are characteristic of a brittle material and the basis for estimating indentation fracture toughness based on the crack lengths. [11,17,28] The radial cracks that are generated by indenting a brittle material are generated by tensile stress during the unloading process and therefore should not affect the hardness measurements. In addition to intragranular radial cracks, intergranular lateral cracks are observed after indenting SAM2Â5/2%W (Figure 3b), which represents a change in the fracture mechanism due to the tungsten dispersed at SAM2Â5 particle boundaries.…”

Section: Resultsmentioning

confidence: 99%

“…[12][13][14]16] There are two ways to introduce the secondary phase, either by an in situ phase precipitated during cooling from the melt or by an ex situ addition of crystalline particles into the BMG matrix. [17] Both of these methods have successfully improved the tensile strainto-failure of BMGs. [17] However, for the in situ method, a shift in the glass chemistry, structure, and properties upon precipitation of the reinforcement phase have been observed, while for the ex situ method, the properties of the glassy matrix are expected to be more stable and predictable.…”

Section: Introductionmentioning

confidence: 99%

“…[17] Both of these methods have successfully improved the tensile strainto-failure of BMGs. [17] However, for the in situ method, a shift in the glass chemistry, structure, and properties upon precipitation of the reinforcement phase have been observed, while for the ex situ method, the properties of the glassy matrix are expected to be more stable and predictable. [17,18] For example, Kelly et al [19] demonstrated that various amounts of tungsten or tantalum can be incorporated into SAM2Â5-630 without significantly altering the matrix.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties of an Fe‐Based SAM2×5‐630 Metallic Glass Matrix Composite with Tungsten Particle Additions

et al. 2018

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We present the role of tungsten additions on the mechanical properties of a Fe-based structural amorphous metal (SAM2Â5-630) containing crystalline tungsten. Matrix cracking by microindentation is inhibited by the addition of tungsten and indicates that tungsten improves the fracture toughness. Response surfaces from nanoindentation arrays indicate that the hardness and modulus of the matrix phase are increased by tungsten additions. Bulk composites with 30 vol% tungsten subjected to 4-point flexure exhibited brittle fracture behavior and the characteristic strength and Weibull modulus were 165 and 8.7 MPa, respectively. The addition of tungsten did not cause devitrification of the matrix phase.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties of an Fe‐Based SAM2×5‐630 Metallic Glass Matrix Composite with Tungsten Particle Additions

et al. 2018

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“…In the supercooled liquid region, which is defined as the temperature range between the glass transition (T g ) and onset of crystallization (T x ), an amorphous alloy exhibits excellent plastic deformability [14][15][16][17][18] . The deformation behavior in this temperature range was extensively studied due to the potential to forming Microelectromechanical systems (MEMS) parts by net shape processing.…”

Section: *Hong-wang Yangmentioning

confidence: 99%

Deformation and fracture of a Zr-Al-Cu metallic glass ribbon under tension near glass transition temperature

Gao

Dong

et al. 2018

China Foundry

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A morphous alloys have excellent mechanical properties compared with traditional crystalline alloys, such as high strength, superplasticity in the supercooled liquid region, good corrosion resistance and large elastic limit [1] . An amorphous alloy is a kind of metallic material with only a short-range order on the atomic scale. Because its microstructure is quite similar to that of glass and it forms from rapid cooling of metals, it is also called metallic glass [2][3][4][5] . Lack of typical defects for polycrystalline alloys, such as grain boundaries and dislocations, metallic glasses attract a lot of research interests on fabrication methods, properties and applications [6][7][8] of tension, even compression [9] . The limited plastic deformation under tension or compression is normally localized in a single primary shear band of about 10 nm thick, rendering no observable global plastic deformation. The localized shear banding introduces a brittle manner of rupture, causing catastrophic failure under loading higher than the strength as in ceramic materials. Thus, the practical application as structural materials is seriously restricted The mechanical behavior and fracture of bulk metallic glasses at room temperature were widely investigated and in-depth fracture analysis was carried out. Zhang [10] et al. found the existence of a large number of radial dimples in the tensile fracture surface in Zr-based metallic glasses at room temperature. Wang [11] et al.found that the tensile fracture morphology of Zr-based amorphous alloy presents a typical vein pattern. A lot of efforts have also been made to enhance global plasticity or ductility of metallic glasses at room temperature. Zhang et al. [12] introduced compression surface stresses to obstruct single primary shear band propagation and shear localization, the remarkable improvement of ductility was obtained in bulk metallic glasses. It is still difficult to achieve tensile ductility of monolithic metallic glasses. Guo et al. [13] employed in situ transmission electron microscope to determine the deformation nature of the small-sized metallic glass under tension. For the 100 nm thick sample, great tensile *Hong-wang YangMale, born in 1974, PhD, associate professor. His research interest mainly focuses on the development of metallic glasses with high glass forming ability, high temperature mechanical behavior and crystallization mechanisms of amorphous alloys.

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“…However, the presence of crystalline phases tends to decrease the global strength of composites as compared to pure matrix glasses. Therefore, sustained efforts have been made to optimize the strength and plasticity of composites by modifying the sizes, spacing, shape, distribution and volume fraction of crystalline phases [13,[24][25][26][27][28][29][30][31]. Among these, the volume fraction is a structural parameter to effectively tune the composite's properties.…”

Section: Introductionmentioning

confidence: 99%

Tuning plasticity of in-situ dendrite metallic glass composites via the dendrite-volume-fraction-dependent shear banding

Liu

Chen

Jiang

et al. 2017

Materials Science and Engineering: A

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A B S T R A C TThis work performs a systematic investigation of identifying how the volume fraction of the in-situ dendrites affects the plasticity of metallic glass composites. The quasi-static uniaxial compressions show that the global plastic strain does not follows a linear rule-of-mixture with the dendrite volume faction, instead, a slow-fastslow enhancement behaviour is observed with increasing dendrite volume fraction. It is demonstrated that the nucleation and propagation of shear bands in these composites are dependent on the dendrite volume fraction. When the dendrite volume fraction exceeds a critical value, multiple shear bands emerge in a spherical plastic zone around a dendrite. It is further proposed that the percolation of these spherical plastic zones contributes to the fast increase in the plastic strain of the glass composites. Our findings offer important implications for the microstructural optimization of the metallic glass composites with desirable mechanical properties.

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Temperature, strain rate and reinforcement volume fraction dependence of plastic deformation in metallic glass matrix composites

Cited by 57 publications

References 46 publications

Mechanical Properties of an Fe‐Based SAM2×5‐630 Metallic Glass Matrix Composite with Tungsten Particle Additions

Mechanical Properties of an Fe‐Based SAM2×5‐630 Metallic Glass Matrix Composite with Tungsten Particle Additions

Deformation and fracture of a Zr-Al-Cu metallic glass ribbon under tension near glass transition temperature

Tuning plasticity of in-situ dendrite metallic glass composites via the dendrite-volume-fraction-dependent shear banding

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