Electromotive force measurements in liquid Ag-In-Pd lead-free alloys

Emf technique was employed to determine indium activities in the liquid Ag-In-Pd alloys using galvanic cells with yttria-stabilised-zirconia as solid electrolyte according to the scheme： kanthal/rhenium, Ag-In-Pd, In2O3 ｜ YSZ ｜ Ni, NiO, Pt. Composition and temperature measurement ranges were limited, because of very steep liquidus surface; 35 compositions for Xpd up to 0.3 were investigated and at temperatures from near-liquidus up to 1700 K. High temperature experiments required special moly furnace to be constructed with unique automatic gas supply system for fumace winding protective atmosphere. Emf readings were taken and recorded by automatic data acquisition system. Linear dependence of emf on temperature was observed for all compositions investigated, and results were approximated by straight line equa- tions. Then In activities were calculated using well-known relations and taking into account correction for thermoelectric power between kanthal and platinum. Results are to be used along with other existing data to perform assessment of the ternary system under accord.

Structure and Properties of Sn-9Zn Lead-Free Solder Alloy with Heat Treatment

The Sn-9Zn lead-free solder alloy was prepared by conventional casting technique then cold-rolled into long sheets of 1 mm thickness and 3 mm width. It was annealed at 80, 120 and 160°C for 60 min to investigate the effect of isochronal heat treatment on structure and mechanical properties of the cold rolled Sn-9Zn alloy. The results showed that, the crystallite size and lattice strain have opposite behavior with increasing annealing temperature due to recovery and recrystalization processes associated with the heat treatment process. Vickers micro-hardness number increases continuously from 155 to 180 MPa with increasing annealing temperature. Ultimate tensile strength (UTS) was also calculated. It was found that, it is equal to 61.4 MPa for the non annealed sample and slightly decreases to 60.5 and 58.2 MPa for samples annealed at 80 and 120°C, respectively. While, increases to 65.4 MPa for the sample annealed at 160°C. Also, ductility increases with increasing annealing temperature in opposite manor with the UTS. The new method for Micro-creep behavior as well as the creep rate calculated by this method has been characterized at room temperature.

Study on the Effect of Production Parameters and Raw Materials Used on the Mechanical Properties of Leaded Brass (CuZn40Pb2) Alloy

Leaded brass alloys used progressively in many applications such as gas valves production owing to their excellent machinability, corrosion resistance and some other specifications. However, the production processes of these alloys involve some problems appearing in the last activities of production as a result of cumulative defects of previous production processes. Therefore, the current investigation studies the effect of process parameters during casting, hot extrusion and cold drawing production stages of CuZn40Pb2 leaded brass alloy on the mechanical properties. Starting with casting process, two types of charges were used. The first charge consists of 100% recycles while the second contains 30% of pure materials such as Cu, Zn and Pb in addition to the recycles. For each production stage, alloy hardness, micro-hardness, ultimate tensile strength and elongation were examined. The results illustrated that high hardness values are obtained during casting process due to some impurities such as iron and the effect of cooling rate through solidification. The hardness values decrease during extrusion process and then rise again by cold drawing for the charge of 30% pure materials. Micro-hardness values for the fractured tensile test samples appeared higher than others due to work hardening effect. The best mechanical properties as ultimate tensile strength of CuZn40Pb2 alloy products are appeared into cold forming samples with the 30% pure material added.

Effects of Ni-Doping on Microstructures and Properties of Zn-20Sn High-Temperature Lead-Free Solders

In the present work, the effect of Ni doping on the microstructures and properties of Zn-20 Sn high temperature lead-free solder has been investigated. Interestingly,Ni was present as the form of Ni-Zn compounds in the microstructure of Zn-20 Sn-xNi alloy.When the Ni-doping amount was 0.2~0.4 wt.%, the presence of δ phase was found, and when the doping amoun was 0.8 wt.%, the presence of γ phase was observed. With the increase of Ni content, the liquidus temperature increased but the solidus temperature did not change obviously. In addition, the microhardness and electrical resistivities of Zn-20 Sn-xNi solder increased gradually. And the spreading area and shear strength increased firstly but decreased afterwards. When the content of Ni was 0.4 wt.%, the spreading area and shear strength of solder reached to be maximum. After the addition of 0.4 wt.% Ni, the microstructure of the interfacial intermetallic compound(IMC) layer of the interface didn't change, but the total thickness of the IMC layer reduced. The δ-phase was embedded in the grain boundary of ε-Cu Zn5, which hindered the diffusion of atoms. The thickness of IMC layer at the interface reduced, which led to the improvement of the shear strength of the interface.

Evaluation of Mechanical and Microstructural Properties of <i>α</i>-Brass Alloy Produced from Scrap Copper and Zinc Metal through Sand Casting Process

Cu-Zn alloy (Brass) is widely used as an industrial material because of its excellent characteristics such as high corrosion resistance, non-magnetism and good forging ability. This paper evaluates the mechanical and microstructure properties of α-brass alloy gotten from scrap copper and zinc metal, and compares the properties with normal α-brass billets. Five different compositions of the α-brass alloy (Cu-5%Zn, Cu-10%Zn, Cu-15%Zn, Cu-20%Zn, Cu-30%Zn) were produced from scraps of copper wire and zinc batteries casing respectively by method of sand casting. The parts of the cast rods were machined to a specification of 60 mm × 100 mm × 300 mm on a lathe to obtain tensile test specimens. After homogenization annealing, the samples were heated in an electric furnace at 500℃ for 3 hours. The samples were etched with ferric chloride solution for 20 seconds and sent for metallographic examination. The result of the hardness test shows variation in hardness of the cast Cu-Zn alloys with increasing zinc content. The ductility and elongation of the α-brass decrease with increasing zinc content. The colouration of the α-brass changed from red to yellow as the zinc content increases. In conclusion, hard brass can be obtained from recycled Cu and Zn as compared to normal brass billets.

Synthesis and Densification of Tungsten-Brass Composite by Mechanical Alloying

Fabrication of full-density W-brass composites is very difficult to achieve because of evaporation of zinc, insolubility of W and brass and compacts expansion. In this study, to achieve full-density W-brass composites, mechanical alloying (MA) and activated sintering process were utilized. Mechanical coating of W with Ni using high energy planetary ball mill was carried out. The milling was divided into two stages: to alloy and modify the surface of W with Ni for enhanced activation. The microstructure of the milled powders and sintered compacts, elemental composition and phases present were studied by using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) respectively. As-received powder compacts was also sintered under the same condition for comparison purpose. The effects of milling time on the microstructure, sinterability and the hardness of the composites were investigated. It was observed that the samples produced from 8 h milled powder had the highest relative sintered density (98% TD) and microhardness (234 Hv). On the other hand, the samples from the as-received powders expanded and had a relative sintered density of (67% TD) and microhardness as low as 24 Hv. The significance of this study is the possibility of producing W-brass composites as a cheaper alternative to W-Cu composites.

EFFECTS OF Zn CONCENTRATION ON WETTABILITY OF Sn-Zn ALLOY ON Cu AND ON THE INTERFACIAL MICROSTRUCTURE BETWEEN Sn-Zn ALLOY AND Cu

The potential of using a hypoeutectic, instead of eutectic, Sn-Zn alloy as a lead-free solder has been discussed. The nonequilibrium melting behaviors of a series of Sn-Zn alloys were examined by differential thermal analysis. It was found that at a heating rate of 5℃/min, Sn-6.SZn exhibited no melting range. Dipping and spreading tests were carried out to characterize the wettability of Sn-Zn alloys on Cu. Both tests exhibited that Sn-6.5Zn has significantly better wettability on Cu than Sn-9Zn. The reaction layers formed during the spreading tests were examined. When the Zn concentration fell between 2.5wt%-9wt%, two reaction layers were formed at the interface, a thick and flat Cu5Zn8 adjacent to Cu and a thin and irregular Cu-Zn-Sn layer adjacent to the alloy. Only a Cu0Sn5 layer was formed when the Zn concentration decreased to 0.5wt%. The total thickness of the reaction layer（s） between the alloy and Cu was found to increase linearly with the Zn concentration.

Effect of SrO Content on Structure,Thermal Properties and Chemical Stability of Bi2O3-B2O3-ZnO-SrO Low-melting Glass for Si-Al Alloy Package

The 40Bi2O3-30B2O3-(30-x)ZnO-xSrO (x=0-15mol%,BBZSr) glass system was prepared by the conventional melt quenching method.The effect of SrO addition on structure,thermal properties,chemical stability and sealing performance of BBZSr glass were investigated thoroughly.The experimental results show that the total proportions of [BO3] group and [BO4] group decrease and the vibrations of [BiO3] group and [BiO6] group become weaker with the increase of SrO addition content,suggesting the glass network structure is strengthened owing to the SrO addition.Hence,both the thermal and chemical stability were significantly improved as the SrO content was increased.When the SrO content increased from 0 to 15mol%,the glass transition temperature and softening temperature slightly increased from 380 to 388 ℃ and from 392.7 to 402.2 ℃,respectively,meanwhile the coefficient of thermal expansion also increased from 10.49×10^-6 to 11.16×10^-6/℃ (30-300 ℃).The BBZSr glass with 15mol% SrO exhibited excellent comprehensive properties with low glass transition temperature(384.9 ℃),low softening temperature(400.3 ℃),high coefficient of thermal expansion (11.14×10^-6 ℃,30-300 ℃),good thermal and chemical stability.Besides,the glass had the good wetting behavior and sealing performance for Al-50%Si alloy.

Solderability of Electrodeposited Fe-Ni Alloys with Eutectic SnAgCu Solder

Solderabilities of electrodeposited Fe-Ni alloys with SnAgCu solder were examined by wetting balance measurements and compared to those of pure Ni and pure Fe platings. Excellent solderability was found on the Ni-52Fe plating as both the wetting force and kinetics approached or exceeded those on the pure Ni. However, upon further increase in Fe content to 75 at. pct, the solderability of the alloy was severely degraded even though it was still better than that of the pure Fe plating. X-ray photoelectron spectroscopy showed that such a strong dependence of solderability on Fe content is related to the much thinner, incomplete oxide coverage of Ni-rich plating surface.

挤压态HNi55-7-4-2镍黄铜合金的热变形行为和加工图

首先,以挤压态HNi55-7-4-2镍黄铜合金为对象,应用热模拟机Gleeble-3500对其进行等温热压缩实验,研究该合金在600~800℃和0.01~10 s^(-1)条件下的热变形行为。其次,基于动态材料模型和极性交互模型,分别建立HNi55-7-4-2镍黄铜合金的Prasad、Murty和PRM加工图,并结合不同变形条件下的微观组织演变,对比3种加工图的预测效果。结果表明:Murty加工图预测效果最差,而Prasad加工图和PRM加工图预测效果较好。HNi55-7-4-2镍黄铜合金的最优热变形加工参数范围为:变形温度为600~725℃,应变速率为0.01~0.07 s^(-1)和变形温度为740~800℃,应变速率为0.05~1 s^(-1)。失稳区的变形机制为局部塑性流动和混晶组织,安全区的变形机制为动态再结晶。

高耐蚀仿金黄铜合金的热变形行为及显微组织演变

通过热压缩实验研究Cu-13Zn-1Ni-1Sn-1.5Al仿金黄铜在温度为953~1123 K和应变速率为0.001~1 s^(-1)条件下的热变形特征。应力-应变曲线表明,流动应力随着温度的升高和应变速率的降低而降低。在0.01 s^(-1)的恒定应变速率下,当温度达到1073 K时,合金的显微组织中出现动态再结晶晶粒。建立合金在不同应变(ε=0.1, 0.2,0.3, 0.4, 0.5, 0.6, 0.7, 0.8)条件下的本构方程并计算其变形激活能。当应变为0.8时,合金的本构方程为=7.22×10^(9)[sinh(0.0187σ)]^(3.67)exp[-227.17/(RT)],变形激活能为227.17 k J/mol。绘制仿金合金在不同应变条件下的功率耗散图和失稳图,得到合金在热压缩工艺中的最佳热变形温度范围为1010~1040 K,应变速率为1 s^(-1)。

H65黄铜合金连续挤压过程中的组织和性能演变特征

采用金相显微镜、维氏硬度仪和万能实验机对H65黄铜合金连续挤压过程中的组织和性能演变特征进行研究。结果表明:连续挤压过程中合金发生了强烈的剪切变形,产生大量的位错和位错缠结,形成取向差较小的亚晶结构;随着变形程度的加剧,合金的温度升高,促进了动态再结晶的发生,小角度晶界通过吸收位错等方式长大成大角度晶界,使亚晶逐渐转变成细小均匀的等轴晶,有效地提高了材料的综合性能。这种组织的演变在力学实验中得到证明。

合金元素对Cu-Zn-Si无铅黄铜组织性能的影响

在含铜65%的无铅硅黄铜中加入磷、镁、锆元素获取新型无铅铜合金。利用金相显微镜、SEM和EDS对其进行物相分析,通过拉伸试验、切削实验评价该合金的力学性能。结果表明,加入磷、镁、锆元素后合金中产生γ相,可改善切削加工性能的作用。其中同时加入磷、镁的合金组织均匀,具有较好的抗拉强度和切削性。

合金元素对黄铜耐腐蚀性能的影响和作用机理

耐蚀黄铜被广泛地用作电厂、海船冷凝管的热交换材料。本文重点介绍了合金元素对黄铜耐腐蚀性能的影响及其作用的机理。在黄铜中添加一定量稀土可以对熔体进行脱氧、细化晶粒组织、改善杂质元素在合金的形态和分布,并与其他元素结合形成缓蚀剂,提高合金的耐蚀性能。添加稀土是未来发展新型环保黄铜的重要方向。

铝合金/黄铜异种金属电弧熔钎焊

采用Zn-15%Al实芯焊丝开展了铝合金/黄铜TIG熔钎焊搭接试验,并对接头力学性能、显微组织和界面层成分进行了测试分析。测试结果发现,焊态下,接头抗拉强度为164MPa;热处理后,接头抗拉强度为160MPa。分析结果表明,热处理后焊缝中的枝晶组织长大,部分柱状晶从界面层脱落进入焊缝,恶化了接头性能。界面层中的金属间化合物主要由CuZn5相组成,以柱状晶向焊缝生长。

黄铜合金主元素Cu、Zn含量的XRF分析

采用X射线荧光分析方法(XRF)分析黄铜合金中主元素含量,阐述了分析的基本原理,采用经验系数法、二元比例法对基体效应进行校正。实验结果表明,采用经验系数法分析黄铜合金中Cu、Zn含量的平均相对误差为0.81%、2.54%;采用二元比例法分析Cu、Zn含量的平均相对误差为1.40%、2.03%;单样分析仅需300 s。

铍青铜代替材料铝镍黄铜合金的研究

采用正交试验 ,确定了铝镍复杂黄铜防爆弹性合金的化学成分 ,并试验了冷挤压变形对合金性能的影响。指出该合金可用于代替铍青铜生产防爆合金及电器弹性元件。

H62黄铜合金热变形行为

结合连续挤压工艺制定Gleeble-1500热压缩试验方案,测定H62黄铜合金流变应力,采用Arrhenius方程的指数形式描述H62黄铜的本构关系,绘制H62黄铜合金的热加工图,预测H62黄铜合金在连续挤压过程中的功率耗散因子η和组织的分布,以及塑性失稳区的位置,确定H62黄铜合金的最佳热变形参数为应变速率为001s-1,温度为400～500℃。

搅拌摩擦焊与手工电弧焊接头电化学腐蚀性能研究

通过测定H65铜合金搅拌摩擦焊接头和手工电弧焊接头在3.5%NaCl溶液中的开路电位和极化曲线,研究其电化学腐蚀性能。结果表明,搅拌摩擦焊接头的抗腐蚀性能优于手工电弧焊接头。搅拌摩擦焊接头微观组织的细化、均匀化和致密化降低了晶界和晶粒在电化学上的不均匀性。手工电弧焊接头脱锌层和基体界面处产生的拉应力对抗腐蚀性能有较大影响。

黄铜H62搅拌摩擦焊接头的微观组织及性能

针对H62黄铜进行搅拌摩擦焊实验研究．初步分析工艺参数对接头的组织及力学性能的影响。结果表明：当焊接速度与搅拌头旋转速度的比值保持在0．09～0.15之间，压入深度在0．1～0.2mm之间时，可得到组织致密、无孔洞的搅拌摩擦焊接头；用搅拌摩擦焊得到的黄铜接头的力学性能比母材低，但比熔化焊得到的接头性能要高，其平均抗拉强度可达到母材的88％。