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纵向磁场对Al-40%Cu过共晶合金定向凝固显微组织的影响沈裕1,任忠鸣2,李喜3,任维丽3(1.上海市上海大学上海市钢铁冶金重点实验室2.上海大学 上海市现代冶金与材料制备重点实验室3.上海大学 上海市现代冶金与材料制备重点实验室,上海 200072)摘 要:研究了纵向磁场对Al-40%Cu(质量分数)过共晶合金定向凝固显微组织的影响.结果表明,在温度梯度GL=42.6K/cm,生长速率R=2μm/s,施加弱磁场时,Al2Cu初生相由规则小平面状逐渐变得不规则,并趋向于非小平面方式生长,热电磁对流效应在不同尺......
；定向凝固；枝晶间距；尖端开裂 中图分类号:TG 113.1; TG 115.21 文献标识码: A Dendrite tip splitting and primary spacing adjustment mechanism of Al-Cu alloy during directional solidification...: The liquid/solid interface morphologies and cellular/dendrite spacing adjustment of Al-4%Cu (mass fraction) alloy were studied during directional solidification. The results show that the primary......
-peritectic alloy; primary dendrite arm spacing; melt convection; directional solidification 1 Introduction Peritectic solidification has attracted more attention in experimental and theoretical studies[1.... The microstructural scales involving the primary dendrite arm spacing (PDAS) and the secondary dendritic arm spacing (SDAS) have been carried out in directional solidification of various peritectic......
of experiment is observed in the range of 1.67×10-5-2.50×10-5m/s. The primary arm spacing decreases with increasing growth rate. Key words: Ti-45Al alloy; directional solidification; growth rate... of lamellar microstructure of TiAl-based alloys, Yamaguchi et al[2, 3] proposed that the mechanical properties of TiAl alloy under uniaxial loading could be improved with directional solidification......
microstructure is composed of a2/g lamellar structure and retained β(B2) after directional solidification. The lamellar orientation is found to be parallel and 45° to the primary growth direction of β.... Key words: Ti-46Al-8Nb alloy; directional solidification; microstructure evolution; microsegregation; lamellar orientation 1 Introduction TiAl-based alloys are considered to be attractive candidate......
,and the natural convection has been confirmed to affect the microsegregation pattern and the dendrite growth velocity.In the directional solidification simulations,two typical temperature gradients were applied... the dendrite growth under melt convection in superalloy solidification.In the isothermal solidification simulations,zero and normal gravitational accelerations were applied to investigate the effects......
of application. Key words:air gap; pool profile; mushy zone; directional solidification; [全文内容正在添加中] ......
by electromagnetic stirring and directional solidification. Additionally, the distribution feature of impurities in Al-Si system was verified. The results show that the impurities are mainly located in Al..., which is obviously improved compared with the 1248.47×10-6 in metallurgical Si. Key words: primary silicon; Al-Si alloy; electromagnetic stirring; directional solidification; impurity 1 Introduction......
microstructure, the eutectic composition of Al-32.5wt.%Cu-0.5wt.%Fe was prepared and directional solidification experiments were conducted using a Bridgman-type furnace at a constant temperature... 1.5. Key words: directional solidification; aluminum alloy; microstructure; tensile strength; hardness 1 Introduction The elements that constitute an alloy material and the microstructure......
are analyzed in terms of the constitutional undercooling criterion. Key words: peritectic reaction; Cu-Ge alloys; directional solidification; microstructure; constitutional undercooling 1 Introduction... of the process of peritectic reaction during directional solidification. And very little is known about the morphological stability of the two phases of the trijunction region during peritectic reaction......
