Interdiffusion and Reaction Between Al and Zr in the Temperature Range of 425 to 475 °C

Mehta, Abhishek; Dickson, J.; Newell, Ryan; Keiser, Dennis D.; Sohn, Yong Ho

doi:10.1007/s11669-019-00729-9

Cited by 15 publications

(6 citation statements)

References 41 publications

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“…The carbides evolution mechanism is determined by the different morphology of the spherical and irregular WC particles. According to the influence of curvature radius on diffusion driving force [19,20], the smaller the curvature radius was, the larger the diffusion driving force and the faster the interface migration were. The tendency of interface migration was to reduce the curvature radius of the interface, making the interface to tend to be flat.…”

Section: Resultsmentioning

confidence: 99%

Microstructures and wear-resistance of WC-reinforced high entropy alloy composite coatings by plasma cladding: effect of WC morphology

Peng

Zhang

et al. 2020

Surface Engineering

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WC-reinforced FeCoCrNi high entropy alloy (HEA) composite coatings with different WC morphology of spherical and irregular shape, were prepared by plasma cladding. The effects of WC morphology on carbide evolution, WC dissolution, and the wear resistance of the coatings were investigated. The results indicated that the evolution of the massive and fishbone M 6 C carbides were significantly influenced by the WC morphology, due to the different curvature radius of WC particles. The dissolution mechanism of spherical WC was diffusion, which of irregular WC was decarburization and oxidation. Although irregular WC particles were broken due to the WC→W 2 C transformation, the wear resistance of the coating with irregular WC was relatively stable, only slightly lower than that of spherical WC, because the developed fish-bone carbide in HEA matrix resisted the three-body abrasive wear of broken WC and W 2 C fragments.

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Section: Resultsmentioning

confidence: 99%

Microstructures and wear-resistance of WC-reinforced high entropy alloy composite coatings by plasma cladding: effect of WC morphology

Peng

Zhang

et al. 2020

Surface Engineering

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“…The evacuation and flushing procedure was repeated several times before the quartz tube was sealed, creating a closed, high purity Ar atmosphere for the diffusion couples. More details on diffusion couple fabrication can be found elsewhere. − Each diffusion couple was isothermally annealed at 900, 1000, 1100, and 1200 °C for 240, 120, 48, and 24 h, respectively. After annealing, all diffusion couples were water quenched to preserve the high temperature microstructure.…”

Section: Methodsmentioning

confidence: 99%

High Entropy and Sluggish Diffusion “Core” Effects in Senary FCC Al–Co–Cr–Fe–Ni–Mn Alloys

Mehta

Sohn

2020

ACS Comb. Sci.

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alloy exhibited a lower free energy of mixing, i.e., higher thermodynamic stability, than equiatomic Al x CoCrFeNiMn compositions, at 1100 °C and above. Therefore, the role of enthalpy was estimated to be significant in achieving higher thermodynamic stability in off-equiatomic alloys, since they always have lower entropy of mixing than their equiatomic counterparts. The magnitude of interdiffusion coefficients of individual elements in Al−Co−Cr−Fe−Ni−Mn alloys were compared to the interdiffusion coefficients in relevant quinary, quaternary, and ternary solvent-based alloys. Interdiffusion coefficients were not necessarily lower in FCC Al−Co−Cr−Fe−Ni−Mn alloys; therefore no sluggish diffusion was observed in FCC HEA, but diffusion of individual elements in BCC Al−Co−Cr−Fe−Ni−Mn alloy followed the sluggish diffusion hypothesis except for Ni. All compositions in the FCC Al−Co−Cr−Fe−Ni−Mn alloy were observed to comply with existing empirical single phase formation rules in high entropy alloys.

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“…Mehta et al [43] determined the parabolic growth constant from diffusion couples of Al versus Zr (99.2 wt.%). Based on their investigation, k p is 2.50 (0.08) × 10 −15 m 2 /s at 425 • C. There are four types of atoms and different phases in the investigated system, so this approximation is strong, yet the two results show an approximately good agreement.…”

Section: Microstructure Of the Hot-pressed Compositesmentioning

confidence: 99%

Strengthening of Nanocrystalline Al with Al3Zr Core-Shell Structure

Janovszky

2020

Metals

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High-density Al-based composites reinforced with ten-wt% recycled nanocrystalline CuZrAgAl particles have been fabricated by mechanical milling, cold- and hot-pressing. The microstructures, phase transformations, and mechanical properties of the mixed powder and sintered samples were investigated. After milling in a ball mill for 30 h, the microhardness of the mixed powder increases to 301 ± 31 HV0.01 and 222 ± 10 HV0.01 without and with ethanol milling, respectively. On account of the interdiffusion, the melting temperature of mixed powder reduces to 574 ± 5.0 °C and 627.5 ± 6.5 °C after 30 h milling. The study showed that the reinforcing particles are homogeneously distributed in the sintered nanocrystalline Al-based composites. During the hot-pressing, a shell zone forms at the interface of reinforcing particles during hot pressing after high energy milling with a minimum of ten hours milling time. This shell zone consists of Al3Zr (D023) phase. The coarsening resistant core-shell structure and grain refinement greatly improve mechanical properties. The compression strength at room temperature varies between 650 and 800 MPa at room temperature and is 380 MPa at 400 °C for the composite containing ten-wt% of the Cu-Zr-based amorphous-nanocrystalline phases. The Brinell hardness of the sintered composite is 329 HB.

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Interdiffusion and Reaction Between Al and Zr in the Temperature Range of 425 to 475 °C

Cited by 15 publications

References 41 publications

Microstructures and wear-resistance of WC-reinforced high entropy alloy composite coatings by plasma cladding: effect of WC morphology

Microstructures and wear-resistance of WC-reinforced high entropy alloy composite coatings by plasma cladding: effect of WC morphology

High Entropy and Sluggish Diffusion “Core” Effects in Senary FCC Al–Co–Cr–Fe–Ni–Mn Alloys

Strengthening of Nanocrystalline Al with Al3Zr Core-Shell Structure

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