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  1. No Access

    Article

    Primary particle melting rates and equiaxed grain nucleation

    Q. Han, A. Hellawell in Metallurgical and Materials Transactions B (1997)

  2. No Access

    Article

    A diffusion solution for the melting/dissolution of a solid at constant temperature and its use for measuring the diffusion coefficient in liquids

    A general solution to the diffusion equation is obtained for the composition in two phases when one phase dissolves and the other grows at constant temperature. The relevance of the derivation to melting is di...

    X. Wan, J. D. Hunt, Q. Han in Metallurgical and Materials Transactions A (1998)

  3. No Access

    Article

    Measurement of liquid permeability in the mushy zones of aluminum-copper alloys

    Measurements of liquid permeability in the mushy zones of Al-15.42 pct Cu and Al-8.68 pct Cu alloy samples were performed isothermally just above the eutectic temperature, using eutectic liquid as the fluid. A...

    A. J. Duncan, Q. Han, S. Viswanathan in Metallurgical and Materials Transactions B (1999)

  4. No Access

    Article

    The nature of surface cracking in direct chill cast aluminum alloy ingots

    Q. Han, S. Viswanathan, D. L. Spainhower… in Metallurgical and Materials Transactions A (2001)

  5. No Access

    Article

    Hydrogen evolution during directional solidification and its effect on porosity formation in aluminum alloys

    Most of the models for predicting porosity formation in aluminum alloy castings use a simple mass balance, such as the lever rule, to track hydrogen enrichment in the interdendritic liquid. However, the hydrog...

    Q. Han, S. Viswanathan in Metallurgical and Materials Transactions A (2002)

  6. No Access

    Article

    Analysis of the mechanism of die soldering in aluminum die casting

    A mechanism of soldering of an aluminum alloy die casting to a steel die is proposed. A soldering critical temperature is postulated, at which iron begins to react with aluminum to form an aluminum-rich liquid...

    Q. Han, S. Viswanathan in Metallurgical and Materials Transactions A (2003)

  7. No Access

    Article

    Permeability measurements of the flow of interdendritic liquid in equiaxed aluminum-silicon alloys

    A method developed recently for measuring instantaneous permeability in the mushy zone of aluminum-copper alloys is used to measure permeability in aluminum-silicon alloys. Permeability was also measured in pa...

    Q. Han, S. Viswanathan, A. J. Duncan in Metallurgical and Materials Transactions B (2003)

  8. No Access

    Article

    The reheating-cooling method: A technique for measuring mechanical properties in the nonequilibrium mushy zones of alloys

    The mushy zone of an alloy is in nonequilibrium during solidification. The mechanical properties of alloys in this nonequilibrium mushy zone, especially at small liquid fractions, are closely related to the fo...

    Q. Han, M. I. Hassan, K. Saito… in Metallurgical and Materials Transactions A (2005)

  9. No Access

    Article

    Fabrication of nylon-6/carbon nanotube composites

    A new technique to fabricate nylon-6/carbon nanotube (PA6/CNT) composites is presented. The method involves a pretreatment of carbon nanotubes synthesized by catalytic pyrolysis of hydrocarbon and an improved ...

    C. Xu, Z. Jia, D. Wu, Q. Han, T. Meek in Journal of Electronic Materials (2006)

  10. No Access

    Article

    Grain Refinement of Pure Aluminum Using Ultrasonics

    C. Allen, Q. Han in International Journal of Metalcasting (2011)

  11. No Access

    Article

    A Developed Method for Fabricating In-Situ TiC p /Mg Composites by Using Quick Preheating Treatment and Ultrasonic Vibration

    Quick preheating treatment of the Al-Ti-C pellets and high-intensity ultrasonic vibration are introduced in the fabrication of in-situ TiC p /Mg composites. Al-Ti-C pellets are p...

    Z. W. Liu, M. Rakita, Q. Han, J. G. Li in Metallurgical and Materials Transactions A (2012)

  12. No Access

    Article

    Formation of Small Blocky Al3Ti Particles via Direct Reaction Between Solid Ti Powders and Liquid Al

    The evolution of titanium powders in the pure aluminum melt at a lower temperature was studied in our research. The process involved some titanium powders being added into the pure aluminum melt at 1003 K (730...

    Z. W. Liu, Q. Han, J. G. Li in Metallurgical and Materials Transactions A (2012)

  13. No Access

    Chapter

    Castability of Magnesium Alloys

    There is intense research effort into the development of high pressure die cast-able creep resistant magnesium alloys. One of the difficulties encountered in magnesium alloy development for creep resistance is...

    A. L. Bowles, Q. Han, J. A. Horton in Essential Readings in Magnesium Technology (2016)

  14. No Access

    Chapter

    Ultrasonic Degassing of Molten Aluminum under Reduced Pressure

    Ultrasonic degassing, an environmentally clean and cheap technique, is an efficient way of degassing in a static volume melt. Vacuum degassing has also been tested a beneficial and clean method in producing hi...

    H. Xu, X. Jian, T. T. Meek, Q. Han in Essential Readings in Light Metals (2016)

  15. No Access

    Chapter

    Grain Refining of Pure Aluminum

    Grain refiners are currently used in casting aluminum alloys to reduce the grain size and to produce equiaxed grains during solidification of the alloys. Using inoculants to refine grains makes alloys castable...

    L. Han, C. Vian, J. Song, Z. Liu, Q. Han, C. Xu, L. Shao in Light Metals 2012 (2016)

  16. No Access

    Article

    Fluidity of Alloys Under High-Pressure Die Casting Conditions: Flow-Choking Mechanisms

    Theories on fluidity of alloys based on the solidification mode are not satisfactory in describing fluidity of alloys under high-pressure die casting (HPDC) conditions. To understand the flow-choking mechanism...

    Q. Han, J. Zhang in Metallurgical and Materials Transactions B (2020)

  17. No Access

    Article

    Application of Refractory Metals to Facilitate Hot Chamber Aluminum Die Casting

    The hot chamber die casting process is capable of producing castings of superior mechanical properties and internal integrity. However, this process cannot be used for die casting of aluminum alloys because th...

    Q. Han, C. Vian, J. Good in International Journal of Metalcasting (2021)

  18. No Access

    Article

    Revisiting the Role of Solutes in Grain Refinement of Hypoeutectic Alloys

    Experimental data on grain size in hypoeutectic alloys with various solute concentrations are collected and analyzed. Curves of grain size as functions of composition are plotted and compared with the relevant...

    Q. Han in Metallurgical and Materials Transactions A (2021)

  19. No Access

    Article

    Cooling-Assisted Ultrasonic Grain Refining of Aluminum E380 Die Casting Alloy

    Die cast alloys have to be poured at temperatures much higher than their liquidus in order to make the alloys castable. Pouring at a high temperature reduces the formation of dendrites in the shot sleeve which...

    C. Vian, C. Kibbey, Y. Chen, C. Kuntz, Q. Han in International Journal of Metalcasting (2022)

  20. No Access

    Article

    Dendritic Features of the Solidification Structure in a Large AA3004 Direct Chill (DC) Cast Ingot

    Slices taken from the largest type of commercial DC casting ingot were examined to reveal its dendritic features to shed lights on the open questions in the literature related to the effect of grain refiners a...

    Q. Han in Metallurgical and Materials Transactions B (2022)