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Search Results: 1 - 10 of 518 matches for " ternary eutectic "
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Rapid solidification mechanism of Ag60Sb34Cu6 ternary alloy in drop tube
Ying Ruan,Nan Wang,Chongde Cao,Bingbo Wei
Chinese Science Bulletin , 2004, DOI: 10.1007/BF03183403
Abstract: Droplets of Ag60Sb34Cu6 ternary alloy within the diameter range of 60–800 μm were rapidly solidified by means of drop tube containerless processing, and the solidification mechanism is analyzed. With a decrease in droplet size, the cooling rate increases from 57 to 5.8×104 K/s. The maximum undercooling is determined to be 180 K (0.23T L) and the microstructure of primary ε(Ag3Sb) dendrite refines drastically until homogenous equiaxed dendrite forms. Experimental results indicate that (ε+Ag) pseudobinary eutectic cannot form under high undercooling conditions and the solubility of Ag in primary ε phase increases as undercooling increases. Based on thermal analysis and crystal growth morphology, it is found that this alloy is solidified in two ways corresponding to different undercooling levels.
Rapid solidification of acoustically levitated Al-Cu-Si eutectic alloy under laser irradiation
Na Yan,DeLu Geng,ZhenYu Hong,BingBo Wei
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4403-5
Abstract: Al-27%Cu-5.3%Si ternary eutectic alloy was melted using a YAG laser and then solidified while being acoustically levitated. A maximum undercooling to 195 K (0.24 T L) was achieved with a cooling rate of 76 K/s. The solidification microstructure was composed of (Al+θ+Si) ternary eutectics and (Al+θ) pseudobinary eutectics. During acoustic levitation, the (Al+θ+Si) ternary eutectics are refined and the (Al+θ) pseudobinary eutectics have morphological diversity. On the surface of the alloys, surface oscillations and acoustic streaming promote the nucleation of the three eutectic phases and expedite the cooling process. This results in the refinement of the ternary eutectic microstructure. During experiments, the reflector decreases with increasing alloy temperature, and the levitation distance always exceeds the resonant distance. Because of the acoustic radiation pressure, the melted alloy was flattened, and deformation increases with increasing sound pressure. The maximum aspect ratio achieved was 6.64, corresponding to a sound pressure of 1.8×104 Pa.
Rapid solidification of undercooled Al-Cu-Si eutectic alloys
Ying Ruan,BingBo Wei
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-008-0540-x
Abstract: Under the conventional solidification condition, a liquid aluminium alloy can be hardly undercooled because of oxidation. In this work, rapid solidification of an undercooled liquid Al80.4Cu13.6Si6 ternary eutectic alloy was realized by the glass fluxing method combined with recycled superheating. The relationship between superheating and undercooling was investigated at a certain cooling rate of the alloy melt. The maximum undercooling is 147 K (0.18T E). The undercooled ternary eutectic is composed of α(Al) solid solution, (Si) semiconductor and θ(CuAl2) intermetallic compound. In the (Al+Si+θ) ternary eutectic, (Si) faceted phase grows independently, while (Al) and θ non-faceted phases grow cooperatively in the lamellar mode. When undercooling is small, only (Al) solid solution forms as the leading phase. Once undercooling exceeds 73 K, (Si) phase nucleates firstly and grows as the primary phase. The alloy microstructure consists of primary (Al) dendrite, (Al+θ) pseudobinary eutectic and (Al+Si+θ) ternary eutectic at small undercooling, while at large undercooling primary (Si) block, (Al+θ) pseudobinary eutectic and (Al+Si+θ) ternary eutectic coexist. As undercooling increases, the volume fraction of primary (Al) dendrite decreases and that of primary (Si) block increases.
Rapid solidification of undercooled Al-Cu-Si eutectic alloys

Ying Ruan,BingBo Wei,

科学通报(英文版) , 2009,
Abstract: Under the conventional solidification condition, a liquid aluminium alloy can be hardly undercooled because of oxidation. In this work, rapid solidification of an undercooled liquid Al80.4Cu13.6Si6 ternary eutectic alloy was realized by the glass fluxing method combined with recycled superheating. The relationship between superheating and undercooling was investigated at a certain cooling rate of the alloy melt. The maximum undercooling is 147 K (0.18T E). The undercooled ternary eutectic is composed of α(Al) solid solution, (Si) semiconductor and θ(CuAl2) intermetallic compound. In the (Al+Si+θ) ternary eutectic, (Si) faceted phase grows independently, while (Al) and θ non-faceted phases grow cooperatively in the lamellar mode. When undercooling is small, only (Al) solid solution forms as the leading phase. Once undercooling exceeds 73 K, (Si) phase nucleates firstly and grows as the primary phase. The alloy microstructure consists of primary (Al) dendrite, (Al+θ) pseudobinary eutectic and (Al+Si+θ) ternary eutectic at small undercooling, while at large undercooling primary (Si) block, (Al+θ) pseudobinary eutectic and (Al+Si+θ) ternary eutectic coexist. As undercooling increases, the volume fraction of primary (Al) dendrite decreases and that of primary (Si) block increases. Supported by the National Natural Science Foundation of China (Grant Nos. 50121101, 50395105) and the Doctorate Foundation of Northwestern Polytechnical University (Grant No. CX200419)
Ternary invariant point at 374°C in the three phase region AlSb-Al-Zn inside the Al-Sb-Zn ternary system
Klan?nik G.,Medved J.
Journal of Mining and Metallurgy, Section B : Metallurgy , 2011, DOI: 10.2298/jmmb110427013k
Abstract: Al-Sb-Zn ternary system was investigated in the three phase region Al-AlSb-Zn, using differential thermal analysis (DTA), differential scanning calorimetry (DSC) and scanning electron microscope equipped with energy dispersive spectrometer (SEM-EDS). The position and temperature of the invariant eutectic L → AlSb + β-Al + η - Zn point inside Al-AlSb-Zn region was experimentally determined. To confirm the obtained results X-ray powder diffraction analysis or XRD was also done. All results were compared to the calculated isopleth phase diagrams using Thermo-Calc software (TCW 5). All calculations were done using the SSOL4 data base.
Formation mechanism of ternary NiAl-Mo eutectic alloy under quenching condition
急冷条件下NiAl-Mo三元共晶合金的组织形成机制

Bian Wen-Hua,Dai Fu-Ping,Wang Wei-Li,Zhao Yu-Long,
边文花
,代富平,王伟丽,赵宇龙

物理学报 , 2013,
Abstract: 采用单辊急冷技术实现了NiAl-Mo三元两相共晶合金的快速凝固, 同时与常规条件下的凝固组织进行了对比研究. 实验发现, 单辊急冷的合金条带与常规条件的凝固样品均由B2结构的NiAl金属间化合物和bcc结构的Mo固溶体两相组成, 两相均具有(110)晶面优先生长的趋势, 并呈现出(110)NiAl//(110)Mo取向关系. 常规条件下得到的微观结构主要由规则的两相共晶组织组成, 形成了类似菊花状的共晶胞. 而单辊急冷条件下形成的组织结构主要是由近辊面的柱状晶区和近自由面的等轴晶区组成的凝固组织. 理论计算发现, 合金熔体的单辊辊速由10 m/s增大至50 m/s后, 其冷却速率从1.01×107 K/s逐渐增大到2.46×107 K/s, 冷却速率明显高于常规铸造过程, 因而形成了差别很大的凝固组织. 随着辊速(冷却速率)的增加, 合金条带的厚度从54.4 μm减小至22 μm, 近辊面柱状晶区的厚度所占比例也逐渐增大, 晶粒发生了明显细化.
Phase constitution and solidification characteristics of undercooled Ag-Cu-Ge ternary eutectic alloy
深过冷Ag-Cu-Ge三元共晶合金的相组成与凝固特征

Mei Ce-Xiang,Ruan Ying,Dai Fu-Ping,Wei Bing-Bo,
梅策香
,阮莹,代富平,魏炳波

物理学报 , 2007,
Abstract: 在Ag38.5Cu33.4Ge28.1三元共晶合金的深过冷实验中,获得的最大过冷度为175 K(0.22TE). XRD分析表明,不同过冷条件下其共晶组织均由(Ag),(Ge)和η(Cu3Ge)三相组成. 在小过冷条件下,三个共晶相协同生长,凝固组织粗大.随着过冷度的增大,共晶组织明显细化,(Ge)相与其他两相分离,以初生相方式生长,而(Ag)相与η相始终呈二相层片共晶方式共生生长. 当过冷度超过80 K时,初生相(Ge)由小过冷时的块状转变为具有小面相特征的枝晶方式生长. 部分小面相(Ge)枝晶出现规则的花状,花瓣数介于5—8之间,并且过冷度越大(Ge)相越容易分瓣. 花状(Ge)枝晶的晶体表面为{111}晶面簇,择优生长方向为〈100〉晶向族.
Potentiometric Determination of Stability Constants of Sulphathiazole and Glycine-Metal Complexes  [PDF]
Awad A. Al-Rashdi, A. H. Naggar, O. A. Farghaly, H. A. Mauof, A. A. Ekshiba
American Journal of Analytical Chemistry (AJAC) , 2018, DOI: 10.4236/ajac.2018.93009
Abstract: Binary and ternary complexes of (Fe(III), Pb(II), Co(II), Al(III), La(III), Sr(II), Cr(III), Ti(II) and Zr(II)) with sulphathiazole (as primary ligand) and amino acid glycine (as secondary ligand) have been studied potentiometrically at 25°C ± 0.1°C and I = 0.1 M NaClO4 in 25% (v/v) pure ethanol-water medium. Although there are many methods available to study the stability of metal-ligand complexes, pH-metry is most frequently used. In extension of our study on solution equilibria, we used Calvin-Bjerrum method for the calculation of stability constants. Stoichiometries and stability constants of binary systems containing the above metal ions in a 1:1 and 1:2 and/or 1:3 ratios were also determined to compare the effect of the secondary ligand on (1:1) Metal:Sulphathiazole system. The protonation constants of the complexes were evaluated for the system M:Sulphathiazole:Glycine = 1:1:1. The order of stability of the binary and ternary complexes was examined. It was found that glycine adds preferably [M-Sulfathiazole] rather than to the aqueous complexes of metal ions. In all cases 1:1:1 complex was formed.
Effect of Bismuth Addition on Structure and Mechanical Properties of Tin-9Zinc Soldering Alloy  [PDF]
Muhommad Abdul Wadud, M. A. Gafur, Md. Rakibul Qadir, Mohammad Obaidur Rahman
Materials Sciences and Applications (MSA) , 2015, DOI: 10.4236/msa.2015.69081
Abstract: Sn-Zn based solder is a possible replacement of Pb solder because of its better mechanical properties. The alloys need to be studied and explored to get a usable solder alloy having better properties. In this work eutectic Sn-9Zn and three Tin-Zinc-Bismuth ternary alloys were prepared and investigated their microhardness and mechanical properties. Microhardness, tensile strength and elastic modulus increase with Bi addition while ductility decreases with Bi addition.
Preparation and Characterization of Binary and Ternary Blends with Poly(Lactic Acid), Polystyrene, and Acrylonitrile-Butadiene-Styrene  [PDF]
Kotiba Hamad, Mosab Kaseem, Fawaz Deri
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2012, DOI: 10.4236/jbnb.2012.33040
Abstract: Binary and ternary blends of poly(lactic acid) (PLA), polystyrene (PS) and acrylonitrile-butadiene-styrene (ABS) were prepared using a one-step extrusion process. Rheological and mechanical properties of the prepared blends were determined. Rheological properties were studied using a capillary rheometer, shear rate, shear stress, non-Newtonian index, shear viscosity and flow activation energy were determined. Mechanical properties were studied in term of tensile properties, stress at break, strain at break, and Young’s modulus were determined. The effect of the composition on the rheological and mechanical properties was investigated. The results show that the ternary blend exhibits shear-thinning behavior over the range of the studied shear rates where the true shear viscosity of the blend decreases with increasing true shear rate, also it was found that the true viscosity of the blend decreases with increasing ABS content. The mechanical results showed that, in the most cases, the stress at break and the Young’s modulus improved by the addition of ABS.
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