复合翅片管的工艺探讨与分析

本文详细论述了轧制Cu/Al复合翅片管的生产工艺，通过分析生产过程中轧制压下量、外管壁厚、组元状态和芯头螺施角对复合管成形的影响，找到了Cu/Al复合管的变形规律，总结出最佳生产工艺。     

复合翅片管的工艺探讨与分析

本文详细讨论了轧制Cu/Al复合翅片管的生产工艺,通过分析生产过程中轧制压下量、外管壁厚、组状态和芯头螺旋角对复合管成形的影响,找到了Cu/Al复合管的变形规律,最后总结出了其最佳生产工艺。     

超大口径双金属复合管材热轧工艺研究

介绍了采用周期轧管机组轧制超大口径油气田高腐蚀环境用X52-X60/825双金属复合管材的生产工艺,并针对X52-X60/825双金属复合管在周期轧制时发生内裂的原因进行了分析,为避免再次出现此类缺陷提供了借鉴。     

Cu/Al复合材料界面组织与性能的研究进展

Cu/Al复合材料拥有优异的导电、导热性能及良好的耐腐蚀性，被广泛应用于通讯、电力和新能源等领域。作为异种金属连接形成的复合材料，其在制备过程中最大的难点在于消除异种金属间热膨胀系数差异等物理性质引起的缺陷，且连接处的界面间组织是影响其性能的主要因素，所以对此进行研究十分重要。综述了超声波焊接、搅拌摩擦焊、爆炸焊和铸造法下Cu/Al复合材料界面金属间化合物（IMC）的种类、形成机理，同时总结了Cu/Al复合材料性能改进常用的辅助手段：在等离子焊接和真空铸造工艺中添加微量元素；在拉拔旋压、轧制和爆炸焊后进行热处理；在超声波焊接、轧制中进行电脉冲辅助。国内外研究者们还广泛应用计算机模拟技术来研究Cu/Al复合材料的界面组织和性能。采用自主研发的冲击射流复合铸造工艺成功制备出Cu/Al复合材料，界面组织为Al2 Cu， AlCu和Al4Cu9，最大结合强度为23 MPa。     

E2钢试制工艺探讨

E2钢在试制中出现了Al的收得率过高、钢锭表面质量差、在轧制时成品产生龟裂等的问题作了较为全面的分析，从理论上阐述了高Al钢在电炉冶炼中Al的收得率和高Cu钢的热加工问题。     

高强度微合金化Q390Eq桥梁钢板的研制

介绍了济钢采用Nb Al或V Al微合金化及控轧技术进行高强度微合金化Q390Eq桥梁钢板的研制情况，并对Nb Al刘成V Al微合金化钢生产工艺及力学性能、焊接性能等进行了分析，摸索出了Q390Eq桥梁钢板的成分设计及控制轧制的工艺参数，对生产高强度、高韧性的微合金化钢板具有参考价值。     

夹层材料对累积叠轧铝基复合材料的组织及性能影响

采用累积复合轧制(ARB)技术制备Al/Cu与Al/Zn两种不同的叠层复合材料,研究了相同工艺下不同夹层材料对轧制后材料的形貌组织与性能的影响。结果显示,在400摄氏度下经过ARB三道轧制后,Al/Cu复合材料夹层由层状向岛状转变,其强度自基体的124Mpa提升至235Mpa,但是塑性大大降低。Al/Zn复合材料夹层保持层状结构,其强度从基体的124Mpa提升到385Mpa,同时延伸率并没有多少下降,当轧制应变达到最大时反而有所提升,表现出优异的力学性能。     

新型铝-锂合金

英国伦敦市金迪魁有限公司发明了一种铝锂合金，其成分（质量％）为：Li2．0～2．8，Mgo．4～1．0，Cu2．4～3．0，Mn0．1～1．2，Zr〈0．2，晶粒控制元素小于2．0，其余为铝。这种合金用于板材轧制，其生产工艺如下：首先进行均匀化处理，形成均匀的Al—Cu-Mn相的次生相质点，以改善合金的强度与硬度，然后进行常规的热轧、固溶处理、淬火、拉伸和时效。     

ML15Al冷镦钢盘条的试制

介绍了采用氧气顶底复吹转炉-LF炉精炼-方坯连铸-高线轧制生产ML15Al冷镦钢盘条的生产工艺.通过对化学成分合理设计及制订适合本厂的冶炼、连铸、轧制工艺,采用Ca处理技术和全程保护浇铸技术相结合的有效措施,解决了浇铸含Al冷镦钢中包水口易堵塞的技术难题.生产的冷镦钢盘条,其产品质量完全符合GB/T6478-2001标准要求,并且获得了用户的好评.     

基于DEFORM的皮尔格热轧复合钢管有限元模拟及分析

根据皮尔格轧机的轧制原理及特点,利用DEFORM-3D软件建立了皮尔格热轧45号钢与316不锈钢复合钢管轧制的有限元模型。完整的模拟了从复合管坯到成品复合管的热轧过程。根据仿真结果,分析了皮尔格热轧复合管坯的过程中,各阶段双层金属壁厚的演变规律、头尾部质量原因、各阶段双层金属管金属流动变化规律、及内外管等效应力分布规律,为实际生产和理论研究提供了指导依据。     

铜铝双金属管连续衬拉复合成形的研究

采用连续衬拉复合工艺线路对铜铝双金属管成形规律进行研究 ,全面探讨了变形量和后序的热处理工艺对界面强度的影响 ,以及在成形过程中组元金属的变形规律。界面强度受变形量及热处理工艺影响较大 ,且组元金属存在不均匀变形规律 ,这为合理制订铜铝双金属管拉伸复合工艺提供了依据。     

Design and Achievement of Metallurgical Bonding of Mg/Al Interface Prepared by Liquid–Liquid Compound Casting via a Co-deposited Cu–Ni Alloy Coating

The metallurgical bonding of Mg/Al bimetal by liquid–liquid compound casting was realized via co-deposition Cu–Ni alloy coating. The metallurgical layer of the Mg/Al bimetal consisted of Cu solid solution, Cu₂Mg and (Al0.7Cu1.3) Mg, Mg solid solution, Al₃Ni₂, and Mg₂Cu. Vickers hardness of the interface was between 149.9 and 209 HV, which was significantly lower than those of Al–Mg intermetallic compounds. The formation mechanism of the interface was attributed to interdiffusion among AZ91D, A356, and Cu–Ni alloy coating.

     

Investigation on the Electron Beam Welding of Al/Cu Composite Plates

The Al/Cu composite plates composed of 2.5 mm thick Al base plate and 0.5 mm thick Cu cladding plate were joined by electron beam welding (EBW). The butt joints of Al/Cu composite plates were obtained successfully in Modes I (Cu cladding plate was placed upon the Al base plate, welding speed of 1400 mm/min) and II (Al base plate was placed upon the Cu cladding plate, welding speed of 1300 mm/min), respectively. The results showed that microstructures under two modes were similar, but there existed some obvious differences in fracture behavior of the joints and damage behavior of Cu cladding plate. For two butt joints, the (Al2Cu + α-Al) eutectic structure was distributed in continuous networks around the α-Al grains in the weld zone. In addition, the interface between Cu cladding plate and weld zone was composed of Al2Cu intermetallic compound and (Al2Cu + α-Al) eutectic structure. The destruction width of Cu cladding plate was greater in Mode I than that in Mode II. Furthermore, the average loads of the EBW joints were 4.8 kN and 4.5 kN in Modes I and II, respectively.     

机械合金化制备Zr50Cu40Ai10非晶合金粉末及其晶化研究

以金属Zr、Cu和Al为原料,通过真空熔炼和气体雾化制备Zr-Cu-Al合金粉末,再经高能球磨得到Zr50Cu40Al10非晶合金粉末。采用氮/氧分析仪、X射线衍射仪(XRD)、扫描电镜(SEM)和热分析仪(DSC)对其非晶形成能力及晶化行为进行研究。结果表明,球磨120h后可获得Zr50Cu40Al10非晶合金粉末,且随球磨时间增加,粉末的颗粒尺寸逐渐减小,90h后达到亚微米级。球磨过程中由于铁的增加,使合金的结构"混乱度"增加、负混合热增大,因而热稳定性增强,其过冷区间ΔTx为62K,约为雾化法制备的非晶合金粉末的2倍。此外,采用非等温晶化方法,用KISSINGER方程计算出机械合金化Zr50Cu40Al10非晶合金的玻璃转变和初始晶化的表观激活能分别为152.6kJ/mol和172.4kJ/mol,远小于相应的气体雾化法制备的Zr50Cu40Al10非晶合金粉末表观激活能,其原因是粉末中氧含量和体系自由能较高。     

钛表面改性Al/NiCu组合涂层反应机理及抗氧化性能

采用等离子结合电弧喷涂的工艺方法在工业纯钛表面制备了Al/NiCu组合涂层,在700℃的大气环境下对Al/NiCu/Ti试件进行加热处理,使得Al、NiCu复合涂层之间发生扩散反应并原位生成具有一定抗高温氧化性能的Ni-Al金属间化合物涂层.对加热改性处理前后涂层的微观组织及Ni-Al金属间化合物的形成机理进行了研究,...     

电子封装用粉末冶金材料

本文阐述了电子封装材料的基本要求与状况，对传统封装材料Al2O3、BeO、SiC的制备工艺、性能指标进行了介绍，着重分析了新型电子封装材料A1N、W／Cu、Mo／Cu、SiC／Al的性能特点和粉末冶金制备工艺的最新研究进展。     

Microstructure and Mechanical Properties of Aluminum/Copper Composite Rod Fabricated by Axisymmetric Spiral Extrusion

In the present investigation, an axisymmetric spiral extrusion was used for fabrication of bimetallic Al/Cu composite rods. In this process, a cylindrical bimetallic sample was extruded through an extrusion die having engraved spiral grooves to produce near net shaped composite part. After preparation of composite rods, the bonding strength was evaluated by applying shear stress on Al/Cu interface using compression test. Also the bonding interface was examined by optical metallography and scanning electron microscopy. The results showed that the bond strength increased in Al/Cu composite rods after spiral extrusion and the bonded interface was free of intermetallic layer. The stress imposed on interface region during spiral extrusion broke the work hardened layer in the mating surfaces, and consequently, the cold weld was established between virgin Al and Cu in the contact area. The obtained results showed a feasibility of spiral extrusion processing for production of Al/Cu bimetallic composite rods.     

Microstructure evolution and densification behaviour of powder metallurgy Al–Cu–Mg–Si alloy

ABSTRACT

An Al–Cu–Mg–Si alloy was prepared by conventional press-sintering powder metallurgy using elemental Al powder. The phase transformation process of Al–Mg, Al–Si alloy and Cu during the sintering process was investigated in details. It was found that a series of phase transitions take place in the alloy to disrupt the oxide film of Al particle and enhance the densification process. The relative density of the sintered samples reached 98%. A new Al–Mg–Cu–O compound was found at the grain boundaries except the MgAl₂O₄ phase, it is speculated that the disruption of the oxide film was also associated with the other alloy compositions except for Mg. Furthermore, no detectable AlN compound was found at the grain boundary region although sintering with flowing nitrogen atmosphere, which is benefit from the high density of the green compact and the excellent wettability between the liquid phase and the aluminium.