The kinetics of devitrification of amorphous alloys: The time–temperature–crystallinity diagram describing the spark plasma sintering of Fe-based metallic glasses

Graeve, Olivia A.; Saterlie, Michael S.; Kanakala, Raghunath; Torre, S.D. De la; Farmer, Joseph C.

doi:10.1016/j.scriptamat.2013.02.019

Cited by 31 publications

(31 citation statements)

References 47 publications

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“…The bulk density of the SAM2X5-600 samples used in this study was 7.9 g/cm 3 and agrees well with our previous results that consider both the theoretical value for SAM2X5 powder (7.75 g/cm 3 ) and structural relaxation that occurs during the consolidation process [12][13][14]. The (identical) processing technique has been used in [12] to produce an amorphous alloy.…”

Section: Resultssupporting

confidence: 90%

“…Bulk SAM2X5 samples were produced using spark plasma sintering (SPS), as previously reported [12][13][14]. SAM2X5 powders were produced by gas atomization and were milled using a Fritsch P5 planetary high-energy ball mill.…”

Section: Methodsmentioning

confidence: 99%

“…While numerous methods to measure mechanical properties of macroscale samples exist, standard testing procedures are often impossible to implement for marginal metallic glass formers because processing limits the sample sizes that can be obtained of these materials. Spark plasma sintering [9][10][11] can overcome this sample size issue for some marginal glass formers so that macroscale properties can be measured [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Bulk Mechanical Properties Testing of Metallic Marginal Glass Formers

Phan

Kelly

Kassner

et al. 2016

Journal of Metallurgy

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We developed a unique three-point bend testing apparatus to measure bulk mechanical properties of a model metallic glass alloy (SAM2X5 with nominal composition Fe 49.7 Cr 17.1 Mn 1.9 Mo 7.4 W 1.6 B 15.2 C 3.8 Si 2.4 ) prepared by spark plasma sintering. The relatively large sample sizes in the present work allowed for the preparation of test specimens with a macroscale cross section (in the millimeter range) with well-controlled sample dimensions closer to standardized tests. Wire saw cutting allowed for a relatively sharp notch radius (3x smaller than previous studies) and minimal sample damage. We determined that Young's modulus and notch fracture toughness measured by our three-point bending apparatus are 230 GPa and 4.9 MPa⋅m 1/2 . Also, Vickers indentation and flexure testing provided consistent results for Young's modulus. Indentation fracture toughness measured by Vickers indentation produced values at least 50% lower than by flexure. The microscale mechanical properties testing technique presented in this work and subsequent analyses are applicable to specimens of other compositions or ones prepared by other methods.

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Section: Resultssupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bulk Mechanical Properties Testing of Metallic Marginal Glass Formers

Phan

Kelly

Kassner

et al. 2016

Journal of Metallurgy

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“…All powders in the study were used in the asreceived state without any modifications to control the particle size distributions. The absolute and relative densities of all the samples, summarized in Table 1, were calculated based on the relative volume fractions and theoretical densities of the SAM2Â5-630 (7.75 g cm À3 [21] ) and tungsten (19.25 g cm À3 [26] ) phases. The compositions were SAM2Â5/x%W, where x ¼ 2, 10, 20, and 30.…”

Section: Resultsmentioning

confidence: 99%

“…Additional details on the SPS process can be found elsewhere. [21][22][23][24][25] Phase development/devitrification of the samples was characterized by X-ray diffraction (Ultima IV, Rigaku, Japan) using CuKα radiation, a step size of 0.02 degrees 2θ, a count time of 1 s, and scanning from 20 to 80 degrees 2θ. Densities of the samples were evaluated by the Archimedes method using a Mettler Toledo Density Kit (Mettler Toledo, Columbus, OH).…”

Section: Methodsmentioning

confidence: 99%

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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Densification and Fracture Responses of (Ta_1−xW_x)C–WC Composites

et al. 2022

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The mechanical behavior of 90 vol% (Ta1−xWx)C–10 vol% WC (x ≈ 0.2) [90(Ta0.8W0.2)C–10WC] composites is described, achieving a significant enhancement in mean fracture strength compared with nominally pure TaC prepared under identical processing conditions (from 114 to 362 MPa), and a higher characteristic strength (from 188 to 377 MPa), while maintaining the same Weibull modulus of 13. The fracture strengths correspond to calculated critical flaw sizes in the range of 5–10 μm and are consistent with the microstructure observations presented. The 90(Ta0.8W0.2)C–10WC composite begins densification at an onset sintering temperature of 1503 K, which is 500 K lower than TaC. It also exhibits enhanced densification by inhibiting grain growth at sintering temperatures up to 2173 K, therefore resulting in a relative density of 98% compared with 80% for TaC. These results show a promising guideline from which ceramic additions can be chosen to enhance the densification and functionality of ultrahigh‐temperature ceramics.

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The kinetics of devitrification of amorphous alloys: The time–temperature–crystallinity diagram describing the spark plasma sintering of Fe-based metallic glasses

Cited by 31 publications

References 47 publications

Bulk Mechanical Properties Testing of Metallic Marginal Glass Formers

Bulk Mechanical Properties Testing of Metallic Marginal Glass Formers

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

Densification and Fracture Responses of (Ta_1−xW_x)C–WC Composites

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The kinetics of devitrification of amorphous alloys: The time–temperature–crystallinity diagram describing the spark plasma sintering of Fe-based metallic glasses

Cited by 31 publications

References 47 publications

Bulk Mechanical Properties Testing of Metallic Marginal Glass Formers

Bulk Mechanical Properties Testing of Metallic Marginal Glass Formers

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

Densification and Fracture Responses of (Ta1−xWx)C–WC Composites

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Densification and Fracture Responses of (Ta_1−xW_x)C–WC Composites