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| 1 | 采用蛇形管通道浇注法制备半固态浆料显示文摘采用蛇形管浇注法制备了半固态A356铝合金浆料。结果表明:当浇注温度为660-680℃时,采用蛇形管可以制备出半固态A356铝合金组织,且管道内没有出现凝固壳:蛇形管通道的直管段长度对半固态浆料组织有较大影响,即直管段长度变短后,浆料组织变差,且制备合适半固态浆料组织的浇注温度也降低;沿径向浆料组织的形貌分布不同,由心部的球状初生α相向过渡区域的球状和蔷薇状初生α相的混合组织转变,边缘部位为蔷薇状的初生α相组织。 | 杨小容 毛卫民 高冲 | 2009 | 中国有色金属学报2009,19,5: | 25 |
| 2 | 金属连续铸挤技术研究进展与发展趋势显示文摘金属连续铸挤技术(CASTEX)是金属连续挤压技术(CONFORM)的进一步发展。较详细地介绍了国内外金属连续铸挤技术的发展历史、现状、趋势以及应用状况。介绍了金属连续铸挤原理及铸挤力能参数的计算公式,并指出连续铸挤过程所形成的金属动态结晶-半固态加工-挤压塑性变形3个阶段及内、外摩擦转换机制,使金属由铸态组织逐渐变为细小的变形组织;简述了连续铸挤机的结构及各部件的作用,并列出了国内外部分铸挤机设备的型号与参数,分析了连续铸挤过程铸挤温度、运转间隙、设备转数及冷却条件等工艺参数对实现连续铸挤工艺控制的影响;讨论了连续铸挤技术同常规挤压比较所具备的特点,实现了铝及其合金,锡及其合金的管、棒、型、线材等的连续铸挤加工成形,在工业生产上得到了应用;最后指出了连续铸挤新技术的发展方向。 | 曹富荣 温景林 | 2013 | 中国材料进展2013,32,5: | 9 |
| 3 | 波浪型倾斜板振动过程中晶粒直接球状长大行为显示文摘利用金相显微镜、能谱仪研究Al-6Si-2Mg合金的凝固与长大行为.研究发现在波浪型倾斜板振动条件下,合金流经斜板表面时在合金凝固过程中伴随着非枝晶组织演化行为,并存在晶粒直接球状长大行为.倾斜板为形核提供足够大的过冷度和异质形核基础,大量晶核在斜板表面和内部形成,使熔体爆发形核,在流动和振动作用下斜板表面形成的晶核游离,弥散到熔体内部,晶核在均匀的成分场与温度场条件下,可以保持直接球状生长.爆发形核与直接球状长大是波浪型倾斜振动条件下合金组织细化与球化的重要机制之一. | 谢丰广 管仁国 李江平 刘相华 | 2009 | 东北大学学报(自然科学版)2009,30,3: | 5 |
| 4 | Semisolid A356 alloy feedstock poured through a serpentine channel显示文摘Fine spheroidal and equiaxed nondendritic microstructures required for semisolid casting can be formed through a serpentine pouring channel.Effects of the pouring temperature and the vertical section length of the serpentine pouring channel were studied.The results indicate that both favorable semisolid microstructures of A356 aluminum alloy can be generated by a serpentine pouring channel,and the solid shell inside the channel can be avoided when the pouring temperature is in the range from 660 to 680°C.It is also shown that the vertical section length of the serpentine pouring channel has a significant influence on the microstructure of the feedstock,namely both the microstructure of the feedstock and the microstructure uniformity in the radial direction get worse when the vertical section length is shortened;moreover,the pouring temperature for obtaining the feedstock with suitable microstructure decreases.The relevant mechanisms were discussed. | Xiao-rong Yang Wei-min Mao Chong Gao | 2009 | International Journal of Minerals,Metallurgy and Materials2009,16,5: | 4 |
| 5 | 振动斜板冷却法制备原位Al-Mg_2Si复合材料的显微组织和力学性能(英文)显示文摘采用被称为振动斜板冷却法(VCS)的一种新型半固态成型技术制备Al-25%Mg_2Si原位复合材料。将熔化的Al-16.5%Mg-9.4%Si合金(过热100°C)浇铸到振动的倾斜铜板表面(倾斜角为45°),其振动频率为40 Hz,振幅为400μm。在斜板上移动40 cm后,将合成的半固态合金铸入钢模中。为了对比,采用重力铸造法(GC)和传统的静止斜板冷却浇铸法(CS)制备合金成分相同的复合材料。将复合材料样品在500°C进行热挤压。与GS制备的合金相比,采用CS和VCS制备的合金中Mg_2Si颗粒尺寸分别减小了50%和70%。与GC制备的样品相比,VCS制备的浇铸态和热挤压态样品,尽管其孔隙率较大,但具有更高的硬度、剪切屈服应力(SYS)和剪切极限强度(USS),这是由于通过这种新型的VCS方法可以得到更细小的微观组织。 | Shaya SAFFARI Farshad AKHLAGHI | 2018 | Transactions of Nonferrous Metals Society of China2018,28,4: | 3 |
| 6 | 近液相线铸造法对高硅铝合金组织与性能的影响显示文摘为获得性能优良的高硅铝合金材料,采用近液相线铸造法制备高硅铝合金坯料,并对坯料显微组织进行金相观察;采用M256-60428金相检验软件计算晶粒尺寸及其圆整度,研究浇注温度对高硅铝合金初生α(Al)相尺寸形貌和力学性能的影响,并采用JSM6490/LV扫描电镜扫描压缩试样断口。结果表明,随着浇注温度的降低,铝合金显微组织呈现由树枝晶向蔷薇状形态、再到球状或粒状组织变化;而后,随着合金熔体处于半固态区间时间的延长,铝合金中的初生α(Al)又开始出现合并长大,圆整度有了明显的改善。随着浇注温度的降低,试样的硬度值也在减小,且减小的梯度不断增大。试样在720℃温度下浇注的抗压强度约为620MPa,得到的高硅铝合金试样在压缩时发生解理断裂;而在605℃温度下浇注的抗压强度则为505MPa,浇注后试样发生了混合断裂。 | 姜华海 李萍 薛克敏 朱财良 张彪 陈龙 | 2011 | 塑性工程学报2011,18,6: | 2 |
| 7 | Numerical simulation of solidification of liquid aluminum alloy flowing on cooling slope显示文摘Preparation of semisolid slurry using a cooling slope is increasingly becoming popular,primarily because of the simplicity in design and ease control of the process.In this process,liquid alloy is poured down an inclined surface which is cooled from underneath.The cooling enables partial solidification and the incline provides the necessary shear for producing semisolid slurry.However,the final microstructure of the ingot depends on several process parameters such as cooling rate,incline angle of the cooling slope,length of the slope and initial melt superheat.In this work,a CFD model using volume of fluid(VOF) method for simulating flow along the cooling slope was presented.Equations for conservation of mass,momentum,energy and species were solved to predict hydrodynamic and thermal behavior,in addition to predicting solid fraction distribution and macrosegregation.Solidification was modeled using an enthalpy approach and a volume averaged technique for the different phases.The mushy region was modeled as a multi-layered porous medium consisting of fixed columnar dendrites and mobile equiaxed/fragmented grains.The alloy chosen for the study was aluminum alloy A356,for which adequate experimental data were available in the literature.The effects of two key process parameters,namely the slope angle and the pouring temperature,on temperature distribution,velocity distribution and macrosegregation were also studied. | N.K.KUND P.DUTTA | 2010 | 中国有色金属学会会刊:英文版2010,20,S3: | 1 |