The Experts below are selected from a list of 1191 Experts worldwide ranked by ideXlab platform

Wayne E. King - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of grain boundary networks and their evolution during grain boundary engineering
    Acta Materialia, 2003
    Co-Authors: Christopher A. Schuh, Mukul Kumar, Wayne E. King
    Abstract:

    Abstract The goal of grain boundary engineering is to increase the fraction of so-called special grain boundaries, while decreasing the contiguity of the remaining random boundaries which are susceptible to intergranular degradation such as cracking, Cavitation, Corrosion and rapid self-diffusion. In the present work, we describe a technique for the quantitative experimental study of grain boundary network topology, with an emphasis on the connectivity of special and random grain boundaries. Interconnected grain boundary networks, or “clusters”, of either entirely random or entirely special boundaries are extracted from electron backscatter diffraction data on a Ni-base alloy, and characterized according to their total normalized length (their “mass”), as well as their characteristic linear dimensions. The process of grain boundary engineering, involving cycles of straining and annealing, is found to substantially reduce the mass and size of random boundary clusters. Furthermore, quantitative assessment of the boundary network topology shows that the special grain boundary fraction is a poor predictor of network topology, but that the higher-order correlation derived from triple junction distributions can successfully describe the length scales of random boundary clusters.

Wenbin Hu - One of the best experts on this subject based on the ideXlab platform.

  • microstructure design to improve the Corrosion and Cavitation Corrosion resistance of a nickel aluminum bronze
    Corrosion Science, 2018
    Co-Authors: Qi Zhang, Zhong Wu, Bin Shen, Wenbin Hu
    Abstract:

    Abstract Microstructure evolution of the nickel-aluminum bronze alloy was studied by heat treatment, including annealing, normalizing, quenching and aging. The microstructure was refined and homogenized after quenching or quenching/aging at 450 ℃, which can eliminate selective phase Corrosion effectively. Compared with the current production process, static Corrosion rate reduced about 50%, due to the rapid formation of a protective film. In addition, Cavitation Corrosion rate reduced by a factor of 4.9 and 7.9 for the quenched and quenched/aged at 450 ℃ samples, respectively. This can be attributed to the improved hardness and weakened synergy between Corrosion and mechanical attack.

Christopher A. Schuh - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of grain boundary networks and their evolution during grain boundary engineering
    Acta Materialia, 2003
    Co-Authors: Christopher A. Schuh, Mukul Kumar, Wayne E. King
    Abstract:

    Abstract The goal of grain boundary engineering is to increase the fraction of so-called special grain boundaries, while decreasing the contiguity of the remaining random boundaries which are susceptible to intergranular degradation such as cracking, Cavitation, Corrosion and rapid self-diffusion. In the present work, we describe a technique for the quantitative experimental study of grain boundary network topology, with an emphasis on the connectivity of special and random grain boundaries. Interconnected grain boundary networks, or “clusters”, of either entirely random or entirely special boundaries are extracted from electron backscatter diffraction data on a Ni-base alloy, and characterized according to their total normalized length (their “mass”), as well as their characteristic linear dimensions. The process of grain boundary engineering, involving cycles of straining and annealing, is found to substantially reduce the mass and size of random boundary clusters. Furthermore, quantitative assessment of the boundary network topology shows that the special grain boundary fraction is a poor predictor of network topology, but that the higher-order correlation derived from triple junction distributions can successfully describe the length scales of random boundary clusters.

Qi Zhang - One of the best experts on this subject based on the ideXlab platform.

  • microstructure design to improve the Corrosion and Cavitation Corrosion resistance of a nickel aluminum bronze
    Corrosion Science, 2018
    Co-Authors: Qi Zhang, Zhong Wu, Bin Shen, Wenbin Hu
    Abstract:

    Abstract Microstructure evolution of the nickel-aluminum bronze alloy was studied by heat treatment, including annealing, normalizing, quenching and aging. The microstructure was refined and homogenized after quenching or quenching/aging at 450 ℃, which can eliminate selective phase Corrosion effectively. Compared with the current production process, static Corrosion rate reduced about 50%, due to the rapid formation of a protective film. In addition, Cavitation Corrosion rate reduced by a factor of 4.9 and 7.9 for the quenched and quenched/aged at 450 ℃ samples, respectively. This can be attributed to the improved hardness and weakened synergy between Corrosion and mechanical attack.

Qiulin Li - One of the best experts on this subject based on the ideXlab platform.

  • improvement of surface resistance to Cavitation Corrosion of nickel aluminum bronze by electropulsing assisted ultrasonic surface rolling process
    Surface & Coatings Technology, 2019
    Co-Authors: Haibo Wang, Guolin Song, Qiulin Li
    Abstract:

    Abstract A surface process electropulsing-assisted ultrasonic surface rolling process (EP-USRP) has been used to treat nickel aluminum bronzes (NAB). Surface quality, hardness and Corrosion resistance were evaluated to analyze the surface resistance to Cavitation Corrosion. The surface roughness was reduced from turning Ra 0.733 μm to EP-USRP Ra 0.050 μm, eliminating the surface turning furrow and improving the surface quality. The surface hardness of the sample treated by EP-USRP at 15 V was increased from 160 HV to 267 HV, and a hardness gradient layer of more than 1000 μm was obtained, thereby improving the surface strength. As the electric pulse which promotes the proliferation and movement of dislocations, the surface strength increased first and then decreased. EP-USRP acts on the surface layer of the lamellar phases to deflect and shred, and tend to be parallel to the surface, which will change the crack propagation path, so that the cracks tend to expand parallel to the surface. Moreover, the samples treated by EP-USRP showed superior Corrosion resistance than untreated ones. The surface weight loss of the samples after EP-USRP was greatly reduced compared with the turning surface. The EP-USRP makes NAB the greater surface quality, the stronger surface layer, the higher Corrosion resistance and the deflection of lamellar phases is the main reason for the improvement of the surface Cavitation Corrosion resistance.