铜－铝复合材料的研究

研究了铜／铝轧制复合工艺对复合板结合强度的影响，指出轧制变形率和热处理工艺是控制结合强度的主要因素。     

铜—铝复合材料的研究

研究了铜／铝轧制复合工艺对复合板结合强度的影响，指出轧制变形率和热处理工艺是控制结合的强度的主要因素。     

电子封装用Cu/Mo/Cu复合材料的工艺研究

研究了浸涂助复剂（铝基合金）和室温轧制工艺对Cu／Mo／Cu复合界面结合强度的影响，简述了Cu／Mo／Cu复合板室温轧制成形工艺过程，详细分析了表面和界面清理、初道次轧制临界变形率及热处理工艺等因素对复合板结合强度的影响。实验结果得出，钼板浸涂Al—Mn—Zn—Sn合金助复剂后的热处理温度为800～850℃；初道次轧制变形率为45％最佳；复合轧制后合适的退火工艺为450℃，保温60min。     

诺威力复合锭铸造法的原理和工艺及应用

采用DC法商业化铸造复合铝合金锭是铝业界工程师几十年来追求的目标之一，2005年底美国诺威力公司奥斯威戈轧制厂在瓦格斯塔夫公司专家的协助下，终于成功地实现了复合锭的工业化规模铸造，到2006年3月份已成功地铸出50多种不同合金的复合锭。用此种锭轧制的1200／2124合金薄板及4147／3003合金钎焊带箔已发往用户。奥斯威戈轧制厂已形成70kt／a复合锭的生产能力，诺威力公司将在韩国蔚山轧制厂与瑞士谢尔轧制厂各建一条铸造复合锭的生产线。复合锭的商业化生产将大大扩大复合铝板带箔的应用范围，在DC法发展历程中具有里程碑意义。     

铝钢复合带材异径轧制变形规律的研究

以4A60铝合金和08Al低碳钢为研究对象,利用异径轧机进行异径同速轧制,从厚度变化、硬度分布及金相组织等几个方面对薄铝复层的铝/钢轧制复合变形区的金属流动规律进行了研究分析。结果表明:铝钢轧制复合过程中铝先于钢达到稳定塑性变形,轧制复合过程中变形区可分为铝钢变形未复合区、铝钢变形复合区和钢变形区。当变形量增加到55%时,钢的硬度从约110HV升高到210HV,而铝层的硬度变化不大,基本保持在(40±5)HV。4A60铝和08Al钢的临界复合压下量为15%左右,当压下量超过45%时,仅发生钢的变形,而铝的厚度基本保持不变。铝层厚度与总厚度的比值(复合比)由轧前的0.054降低到轧后的0.052,说明轧制复合过程中铝的变形更大。     

冷轧铜铝复合板结合界面速度场分析（英文）

通过有限(FEM)元速度场研究了冷轧铜铝双层板的复合过程,将该过程中金属的变形特征进行了分析,同时,将有限元计算结果与某工厂数据相结合,分析了轧制速度、压下率、异径同步、异径异步对铜铝双层板复合的影响。结果表明,速度场模型能够更有效地说明铜铝板的复合过程;轧制速度越大,变形区出口处复合面金属流动的同步性越差,复合强度越低;异径同步轧制铜铝复合板时,辊径比取1.4~1.6,变形区出口处复合面金属流动的同步性越好,复合强度较高;异径异步轧制铜铝复合板时,轧制速比取1.2,变形区出口处复合面金属流动的同步性越好,复合强度较高。     

冷轧铜铝复合板结合界面速度场分析

文章通过有限元速度场研究了冷轧铜铝双层板的复合过程，将该过程中金属的变形特征进行了分析，同时，将有限元计算结果与某工厂数据相结合，分析了轧制速度、压下率、异径同步、异径异步对铜铝双层板复合的影响。研究表明，速度场模型能够更有效地说明铜铝板的复合过程；轧制速度越大，变形区出口处复合面金属流动的同步性越差，复合强度越低；压下率越大, 变形区出口处复合面金属流动的同步性越强，复合强度越高；异径同步轧制铜铝复合板时，辊径比取1.4~1.6，变形区出口处复合面金属流动的同步性越较好，复合强度较高；异径异步轧制铜铝复合板时，轧制速比取1.2，变形区出口处复合面金属流动的同步性越较好，复合强度较高。     

铜/铝/铜轧制复合板的退火工艺研究

研究了低温长时间和高温短时两种退火工艺对铜／铝／铜轧制复合板的成型性能及界面结合强度的影响，讨论了退火强化现象没有出现的原因。结果表明，退火处理不能提高铜／铝／铜轧制复合板的结合强度，只能改善复合板的成型性能。铜／铝轧制复合板宜采用高温短时退火制度，退火温度选择580～625℃，时间控制在10min以内，此工艺得到的铜／铝轧制复合板综合性能最佳。     

铝—钢双金属复合轧制层厚比及轧制力的研究

用实验方法研究了铝－钢双金属复合轧制时层厚比的变化规律。给出了双金属复合时轧制力的计算式。     

铜铝异步轧制复合工艺及组织性能

采用异步轧制工艺进行了铜铝薄带的复合,并对复合带进行了退火处理,利用金相显微镜、扫描电镜和拉伸试验机进行了复合带组织的观察和性能的测定.结果表明,异步轧制相比同步轧制的界面波浪状形貌明显减少,界面更加平整;在相同的压下率下,异步轧制的轧制力要小于同步轧制的轧制力,使轧制的稳定性和精度得到了提高,有益于提高界面剥离强度;异步速比与复合带界面的剥离强度呈抛物线关系,异速比为1.25界面的剥离强度最大;异步速比增加,铜/铝复合带Cu/Al厚度比增加.所得结果在铜铝薄带轧制复合领域的研究有重要意义.     

Heat dissipative Pb-free bonding technology using Al-rich Zn/Al/Zn clad solder

Al-rich Zn/Al/Zn clad solder were developed as Pb-free solder for a die-attachment. The Zn/Al/Zn clad solder was produced by clad rolling of Zn and Al strips in order to prevent Al from oxidation and improve wettability. The Zn/Al/Zn clad solder was melted at 382°C after solid-state interdiffusion of the Zn and Al layers. Bonding was successfully achieved with bonding pressure of a few kilopascals. Thermal cycle life of Invar-to-Cu substrate joint using the Zn/Al/Zn clad solder was longer than that of Pb-Sn-Ag solder. No Kirkendall voids were observed in the vicinity of the bonded interface after ageing at 250 °C for 1000 h.     

Effect of rolling on interfacial property of steel/mushy Al-20Sn bonding plate

1　INTRODUCTIONSteel/Al 2 0Snbondingplateisidealmaterialforneotypebearing[1] .Itiswidelyusedinthefieldssuchasmachinery ,automobile ,etc[2 5] .Forthisbondingplate ,twothingsareveryimportant.Oneisthedis tributionofSnparticlesinAl 2 0Snlayer ,theotheristheinterfacialshearstrength .Theformerdeterminesthelifeofbonding plate .Thelatterdeterminesthesafetyofbondingplate .TheevenerthedistributionofSnparticlesinAl 2 0Snlayer ,thelongertheusagelifeofbondingplate .Thelargertheinterfacialshearstr…     

Cu/Al层厚比对波纹辊轧制Cu/Al复合板变形行为和结合性能的影响

本工作通过抗剪切强度测试、剪切断面显微观察和有限元仿真等手段对不同Cu/Al层厚比下波纹辊轧制（CRB）Cu/Al复合板的金属的变形行为和界面结合性能进行了研究。结果发现，CRB过程中界面处形成了局部强正应力和多个“搓轧区”，促进了复合板的塑性变形和界面结合。增大Cu/Al层厚比可提升Cu层的变形率和波谷界面处的正应力，有利于降低Cu/Al复合板的翘曲程度，并增强界面的整体结合性能。当层厚比从2:10增加到2:4时，界面抗剪切强度从40.39MPa上升到47.24 MPa，但界面抗剪切强度的波动逐渐增大。     

Fabrication and Characterization of High-Bonding-Strength Al/Ti/Al-Laminated Composites via Cryorolling

Sandwich-like Al/Ti/Al-laminated composites have many advantages such as low density and high specific strength with value in mechanical manufacturing and aerospace engineering. Here, Al/Ti/Al-laminated composites were fabricated by hot roll bonding and subsequent processes: cryorolling(-190 ℃ and-100 ℃), cold rolling(25 ℃), and hot rolling(300 ℃). Their bonding strength and mechanical properties were then studied by an Autograph AGS-X universal electronic testing machine. The results show that cryorolling can improve the interface bonding strength and tensile strength of Al/Ti/Allaminated composites. For the Al/Ti/Al-laminated composites subjected to cryorolling at-100 ℃, they have the highest strength near 260 MPa—this is 48 MPa and 41 MPa higher than the laminated composites subjected to cold and hot rolling, respectively. These results also show the strongest peeling strength. Finally, the mechanisms of the enhancement of bonding strength and mechanical properties of Al/Ti/Al-laminated composites subjected to cryorolling were mainly discussed.     

Hot Roll Bonding of Aluminum to Twin-Roll Cast (TRC) Magnesium and Its Subsequent Deformation Behavior

In an experiment in which twin-roll cast AZ31 magnesium alloy and commercial purity aluminum (AA 1050) sheets were bonded by hot rolling as Al/Mg/Al laminate composites, it was found that increasing the preheating temperatures up to 400 °C enhances the bonding strength of composites. Further increases in the preheating temperatures accelerate the magnesium oxide growth and thus reduce the bonding strength. The influence of the reduction ratio on the bonding properties was also studied, whereby it was observed that increasing the rolling reduction led to an increase in the bonding strength. The experimental results show that the optimum bonding strength can be obtained at rolling temperatures of 375-400 °C with a 50-60% reduction in thickness. On the other hand, the subsequent deformation behavior of composite was assessed using plane strain compression and deep drawing tests. We demonstrate that the composites produced using the optimum roll bonding conditions exhibited sufficient bonding during subsequent deformation and did not reveal any debonding at the bonding interface.     

轧制参数对钛/铝轧制复合板的结合强度和剥离面SEM形貌的影响

研究了钛/铝的轧制复合工艺对轧后结合强度和剥离面形貌的影响。试验结果表明,钛的变形程度是控制结合强度和剥离面形貌的主要因素;轧制时铝的温度对结合也有重要的影响。在钛和铝的热轧复合中并存着3种结合机制。     

Microstructures and mechanical properties of TC4/AZ91D bimetal prepared by solid–liquid compound casting combined with Zn/Al composite interlayer

To achieve Ti/Mg bimetallic composite with high strength and metallurgical bonding interface, Al interlayer and Zn/Al composite interlayer were used to prepare TC4/AZ91D bimetal composite with metallurgical bonding interface by solid–liquid compound casting, respectively. Al interlayer was prepared on the surface of TC4 alloy by hot dipping, and Zn/Al composite interlayer was prepared by electroplating process. The results suggested that the phases across the interface were AlTi and α(Al) + Mg₂₁(Al, Zn)₁₇ when Zn/Al composite interlayer was used. When Al interlayer was used as interlayer, AlMgTi ternary structure and Al₁₂Mg₁₇ + δ-Mg eutectic structure were the main phases at the interface. The shear strength of TC4/AZ91D bimetal with Zn/Al composite interlayer was much higher than that with pure Al interlayer, and the value of the shear strength was increased from 48.5 to 67.4 MPa. Thermodynamic models based on different compositions of the interface were established to explain the microstructure evolution of the interfacial zone.     

冷轧制备AlSn20Cu/钢多层板的微观组织和力学性能（英文）

通过室温冷轧制备出了1060Al/AlSn20Cu/1060Al/钢多层复合板材,并探索了轧制压下量对复合板微观组织和力学性能的影响。利用扫描电子显微镜和电子背散射衍射（EBSD）对复合板微观组织进行表征,通过拉伸试验测量了复合板力学性能。复合板的初始轧制压下量为17%,最小稳定压下量为40%。结果表明,随着轧制压下量的增加,铝合金层中锡相和钢中组织沿轧制方向被拉长,但是纯铝层呈现出等轴晶。随着轧制压下量的增大,复合板抗拉伸强度和界面结合强度增加,而延伸率下降。AlSn20Cu合金层的断裂主要跟其中的锡相有关。     

Brazing method to join a novel Cu54Ni6Zr22Ti18 bulk metallic glass to carbon steel

This study joined a novel Cu-based bulk metallic glass (BMG) to carbon steel using a brazing process. Cu₅₄Ni₆Zr₂₂Ti₁₈ BMG was brazed to SS400 carbon steel using filler metal at 713?K under a compressive stress of 15?MPa for 3?min. Considering the relatively low glass-forming ability, pure Zn and Zn–Ag–Al filler metals were selected to suppress the crystallisation during a reheating thermal cycle. A sound bonding interface without notable chemical diffusion was obtained using the suggested brazing method, particularly with the Zn–Ag–Al filler. This gave rise to considerable improvement in shear bonding strength, from 9 to 45?MPa, when replacing the Zn filler with the Zn–Ag–Al filler. The present method also induced no marked change in phase composition of the BMG due to the low bonding temperature and short bonding time. Slight variations in glass transition temperature and crystallisation temperature would result from a thermal annealing effect.     

Research on the Al/Mg/Al Three-layer Clad Sheet Fabricated by Hot Roll Bonding Technology

The three-layer clad materials consisting of Al(AA1100) / Mg(AZ31) / Al(AA1100) plate was fabricated by the hot roll bonding method. The crucial technological parameters of manufacturing clad sheet, including the threshold rolling reduction and clad-rolling bonding conditions were investigated. This clad sheet was produced successfully by hot roll bonding with the intermetallic phase formation, which can be observed using conventional optical microscope. The bond interfacial structures of the AZ31 / AA1100 ...