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Resistance spot welding of Ti_(40)Zr_(25)Ni_3Cu_(12)Be_(20) bulk metallic glass:experiments and finite element modeling

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Rare Metals 2017年第2期36卷 123-128页

作者： Gang Wang Yong-Jiang Huang deodat makhanlall Jun Shen School of Mechanical and Automotive Engineering Anhui Polytechnic University School of Materials Science and Engineering Harbin Institute of Technology

The use of resistance spot welding（RSW）technology for joining Ti40Zr25Ni3Cu12Be20 metallic glass was *** microstructure obtained from the welded BMG sample was *** without precipitates was prepared with welding current of 5.0 kA for 2cycles.A fully coupled thermal-electrical-mechanical finite element model（FEM） was developed to complement the experimental *** simulated results agree well with the *** effects of key process parameters such as welding current and welding time on the evolvement and microstructure of the weldment were determined and ***,the critical cooling rate for preserving the amorphous state in the weld fusion zone is determined to be approximately 1×10^3 K·s^-1.

关键词： Metallic glasses Simulations Resistance spot welding Cooling rate

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Thermodynamic Head Loss in a Channel with Combined Radiation and Convection Heat Transfer

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Journal of Power and Energy Engineering 2014年第9期2卷 57-63页

作者： deodat makhanlall Peixue Jiang Department of Thermal Engineering Tsinghua University Beijing China

Losses in channel flows are usually determined using a frictional head loss parameter. Fluid friction is however not the only source of loss in channel flows with heat transfer. For such flow problems, thermal energy degradation, in addition to mechanical energy degradation, add to the total loss in thermodynamic head. To assess the total loss in a channel with combined convection and radiation heat transfer, the conventional frictional head loss parameter is extended in this study. The analysis is applied to a 3D turbulent channel flow and identifies the critical locations in the flow domain where the losses are concentrated. The influence of Boltzmann number is discussed, and the best channel geometry for flows with combined heat transfer modes is also determined.

关键词： Radiation-Convection Heat Transfer Thermodynamic Head Loss Entropy Generation

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