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Growth kinetics for intermetallic compound layer between molten In-Sn alloy and CuZr-based bulk metallic glass

Transactions of Nonferrous Metals Society of China 2012年第4期22卷 837-841页

作者：马国峰张波张海峰胡壮麒沈阳大学辽宁省先进材料制备技术重点实验室沈阳110044 中国科学院金属研究所沈阳110016

The growth kinetics of intermetallic compound layer between molten In-Sn alloy and Cu40Zr44Al8Ag8 bulk metallic glass substrate was examined by solid state isothermal aging at the temperature range between 333 and 393 *** aged samples were characterized by scanning electron microscopy and energy dispersive *** is found that the intermetallic compound layer is composed of Zr,Cu and *** layer growth of the intermetallic compound is mainly controlled by a diffusion mechanism over the temperature range and the value of the time exponent is approximately *** apparent activation energy for the growth of total intermetallic compound layers is 98.35 kJ /mol calculated by the Arrhenius equation.

关键词： bulk metallic glass compound layer kinetics diffusion mechanism

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Effect of the compound layer of Plasma Nitriding on Thermal Fatigue Behavior of 4Cr5MoSiV1 Die Steel

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Journal of Shanghai University(English Edition) 2003年第1期7卷 87-92页

作者：彭文屹吴晓春闵永安许珞萍 School of Materials Science and Engineering Shanghai University

With the Uddeholm self restricted method, the effect of compound layer of plasma nitriding on thermal fatigue behavior of 4Cr5MoSiV1 steel was studied by the way of adding Ar during plasma nitriding to remove the compound layer. The results show that the compound layer of plasma nitriding can delay the nucleation of heat cracks and hold back the propagation of heat cracks from surface to substrate because of its high hardness and strength. On the other land, the heat checking expands faster with the compound layer on the surface than that without it. After 3000 cycles of thermal fatigue test, both heat cracks with the compound layer are wider than the another without compound layer and the number of heat cracks of the former is more from the view of cross section.

关键词： Cr5MoSiV1 steel plasma nitriding compound layer thermal fatigue behavior thermal stress.

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Influence of Processing Parameters on the Mechanical Properties of a Plasma Radical Nitrided SCM440 Steel

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Journal of Materials Science & Technology 2008年第3期24卷 356-358页

作者： Seok-Hwan Ahn Insup Lee School of Mechanical Engineering Pukyong National University Department of Materials and Metallurgical Engineering Dongeui University

Plasma radical nitriding was performed to harden the surface of SCM440 steel for 1-10 h at temperature range of 450-550℃. This process involved the use of NH3 gas instead of N2 gas employed for the well-established plasma nitriding method. No compound layer was formed during this process except the experiment carried out at 500℃ for 10 h. The main phase produced in the diffusion zone was identified to be γ＇-Fe4（N, C）. A diffusion depth increased with increasing treatment temperature and time （up to about 250 μm）. The surface hardness of radical nitrided layer was about two times higher than that of the untreated surface. The tensile test was carried out to estimate the mechanical properties of surface-hardened SCM440 steel prepared at various plasma radical nitriding treatment time and temperature. The influence of radical nitriding treatment on the tensile strength of the specimen was found to be insignificant. The highest value of the ultimate tensile strength was obtained in the experiment carried out at 500℃ for 1 h. However, the elongation was greatly affected by the radical nitriding processing parameters. The maximum value of elongation, which is equal to about 18.1%, was also obtained under the condition of 500℃ for 1 h.

关键词： Plasma radical nitriding Tensile strength Elongation Surface hardness Diffusion depth compound layer

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