Al－Cu5系铝合金的强化

对自行熔炼的Ａｌ－Ｃｕ５－Ｎｉ－Ｍｎ－Ｃｏ系列高强度耐热铸造铝合金进行了固溶处理及时效处理的试验研究。结果表明，用Ａｌ－Ｔｉ中间合金进行细化晶粒处理，在优化的热处理工艺条件下，不但强度高，而且热疲劳性能好。     

Al—Cu5系铝合金的强化

对自行熔炼的Ａｌ－Ｃｕ５－Ｎｉ－Ｍｎ－Ｃｏ系列高强度耐热铸造铝合金进行了固溶处理及时效处理的试验研究。结果表明，用Ａｌ－Ｔｉ中间合金进行细化晶粒处理，在优化的热处理工艺条件下，不但强度高，而且热疲劳性能好。     

Al2O3/(Ag72Cu28)97Ti3/Ti-6Al-4V界面反应

在１．８　ｋｓ、１　０７３～１　１７３　Ｋ条件下对Ａｌ２Ｏ３／（Ａｇ７２Ｃｕ２８）９７Ｔｉ３／Ｔｉ－６Ａｌ－４Ｖ进行了钎焊试验。通过扫描电镜、波谱、能谱和Ｘ射线衍射对界面反应产物进行了测试，确定了界面结构，并讨论了这些反应产物形成的可能性。结果表明，温度小于１　１２３　Ｋ的界面结构为Ａｌ２Ｏ３／Ｃｕ２Ｔｉ４Ｏ／Ｃｕ４Ｔｉ３＋Ｃｕ固溶体／Ａｇ－Ｃｕ共晶　＋　富Ａｇ相；温度１　１７３　Ｋ的界面结构为Ａｌ２Ｏ３／Ｃｕ３ＴｉＯ５　＋　ＣｕＡｌ２Ｏ４／Ｃｕ４Ｔｉ３／富Ａｇ相＋　Ｃｕ４Ｔｉ３。     

添加微量锰元素对Cu—Zn—Al形状记忆合金性能的影响

本文研究了添加微量锰元素对Ｃｕ－Ｚｎ－Ａｌ形状记忆合金性能的影响。得出：锰元素的加入，降低了Ｃｕ－Ｚｎ－Ａｌ合金的相变温度，提高了Ｃｕ－Ｚｎ－Ａｌ合金的形状记忆性能，使Ｃｕ－Ｚｎ－Ａｌ合金的形状记忆性能，使Ｃｕ－Ｚｎ－Ａｌ合金的强度下降，塑性提高。     

半固态金属成形技术(下)

五、半固态成形的应用1.在铝合金制备中的应用目前半固态金属成形应用最成功和最广泛的是在铝合金的制备中。其原因不仅是因铝合金的熔点较低和使用范围广泛 ,而且铝合金是具有较宽液固共存区的合金体系。在铝合金工业中 ,包括Ａｌ Ｃｕ合金、Ａｌ Ｓｉ合金、Ａｌ Ｐｂ合金和Ａｌ Ｎｉ合金等 ,特别值得一提的是半固态金属成形技术已开始应用于制备铝合金制品。图 3所示是半固态成形的铝合金零件。目前 ,半固态成形的铝合金零件重量可达 7ｋｇ以上。图 3　半固态成形的铝合金零件2 .在其它材料中的应用对于镁合金和铜合金 ,也可以应用ＳＳＭ…     

铝/铜拉拔复合工艺的研究

为了提高Al/Cu复合材料的性能及使用价值,研究了在不同的拉拔工艺参数条件下Al/Cu的复合成形,获得了有利于这2种金属成形的工艺参数.通过对拉拔复合后的Al/Cu双金属棒的扩散退火试验,探讨了热处理规范对双金属复合界面的影响规律.结果表明,拉拔的变形程度对Al/Cu界面复合效果起重要作用,随着变形程度的增加Al/Cu界面复合的效果得到明显改善.拉拔变形程度大于28%的Al/Cu棒复合较好;对于Al/Cu拉拔复合棒可以采用的热处理规范为:温度400 ℃,保温时间2 h.     

ZCuAl10Fe3合金铸件生产实践

叙述了ＺＣｕＡｌ１０Ｆｅ３合金从制定工艺到生产操作，从原材料准备到合金熔炼，从造型到浇注铸件等环节中必须掌握的工艺要点，并分析了ＺＣｕＡｌ１０Ｆｅ３合金容易产生铸造缺陷的原因和提高铸件质量的有效途径。     

用回转水纺丝法制备Cu－Al－Ni形状记忆合金细丝

本文介绍了用回转水纺丝法制备Ｃｕ－Ａｌ－Ｎｉ状记忆合金细丝的新技术，得到了最佳制备工艺参数，研究了合金丝的组织和性能。     

Cu,Fe,Mn对压铸AlSi9Cu3性能影响

本文通过对压铸ＡｌＳｉ９Ｃｕ３中合金元素Ｃｕ,Ｆｅ,Ｍｎ正交试验,研究了Ｃｕ,Ｆｅ,Ｍｎ合金元素对压铸铝合金ＡｌＳｉ９Ｃｕ３的力学性能影响。     

用回转水纺丝法制备Cu—Al—NI形状记忆合金细丝

本文介绍了用回转水纺丝法制备Ｃｕ－Ａｌ－Ｎｉ状记忆合金细丝的新技术，得最佳制备工艺参数，研究了合金丝的组织和性能。     

Pulse current auxiliary TLP diffusion bonding of SiCp/2024Al composite sheet using mixed Al–Cu–Ti powder interlayer

Pulse current auxiliary transient liquid-phase (TLP) diffusion bonding of SiCp/2024Al composite sheet was investigated at 580 °C using mixed Al–Cu–Ti powder interlayer. The optimal process parameters were applied as follows: pulse current density of 1.15?×?10² A/mm², pressure of 0.5 MPa, vacuum of 1.3 ×?10^?3 Pa, and bonding time from 15 to 60 min. The bonding quality is evaluated by microstructure characterization and mechanical properties of the joints. The mechanism of pulse current auxiliary TLP diffusion bonding process is analyzed. The results indicated that the dense joints without cavity consisted of the Al-based solid solution, pure Ti, Al₂Cu, and TiAl₃ intermetallic phase. Microhardness of joints was obviously higher than Cu diffusion zone and substrate materials zone. The shear strength of the joints monotonically increased with bonding time. The maximum value exceeded 154.1 MPa in bonding time of 60 min. Pulse current generated Joule heat, high-temperature spark plasma, and electromigration, which guarantee the feasibility of bonding process and high-quality joint.     

液固结合双金属复合材料界面研究

采用改进镶铸法制备了高碳高钒系高速钢/45钢双金属复合材料,研究了不同工艺参数下复合材料的界面组织和结构。试验结构表明,控制适当工艺参数可以获得结合良好的界面。双金属复合材料界面结合形式主要为扩散结合,镶铸比和保持时间对复合材料结合界面结构均有明显影响。     

Additive manufacturing of steel–bronze bimetal by shaped metal deposition: interface characteristics and tensile properties

In this paper, mild steel–silicon bronze bimetal based on the single-pass multi-layer model was fabricated by shaped metal deposition utilizing gas metal arc welding technology. Suitable deposition parameters of silicon bronze were chosen to match the specific size of mild steel wall. Then the characteristics of interface were analyzed. The results show that Cu element did not exist on the steel side, but Fe element entered the bronze side in the forms of particles and big chunks. Meanwhile, owing to the physical and chemical reasons, the silicon element concentrated in the intermixing zone and on the bronze side where Fe element appeared. The interface between steel and bronze had good adhesion without cracks or pores, and metallurgical bonding was achieved. The tensile strength of the bimetal reached 305 MPa and fracture occurred near the middle of bronze side, implying a firm connection between steel and bronze was obtained.     

Al_2O_3Cu-Ti-Zr/Nb钎焊研究

使用Cu Ti Zr钎料对Al2 O3 Nb进行了钎焊试验。通过扫描电镜、能谱、X射线衍射分析了界面形貌、元素分布 ,并对反应相进行了判定。Cu70 Ti2 5 Zr5 钎料在 12 93K、10min条件下界面产生了 3种新相 :Cu2 Ti4O、Ti固溶体、CuTi,界面结构为Al2 O3 Cu2 Ti4O Ti固溶体 CuTi Cu固溶体 +CuTi。采用拉剪试验评定了强度 ,结果证实12 93K、10min ,使用Cu70 Ti2 5 Zr5 钎料的接头强度最高达到 16 2MPa ,增加或减少Ti的质量分数以及改变保温时间都会使接头抗剪强度下降。     

铜/铝复层板成形极限视觉测量方法及成形性能

基于数字图像相关法（DIC）与双目视觉技术,提出并实现了一种用于爆炸焊接制备的铜/铝复层板成形极限应变的视觉测量方法,利用有限元模拟结果对该方法进行验证。根据DIC方法获得的板料成形极限应变,分析热处理工艺及接触状态对铜/铝复层板成形极限的影响,使用扫描电子显微镜对界面与断口形貌进行观察分析。结果表明：DIC方法测得的铜/铝复层板失稳破裂时的最大主应变与有限元模拟结果的相对误差为0.1%,且应变值分布与有限元模拟吻合也较好;铝在内层时复层板成形极限大于铜在内层时的成形极限;经过退火处理的铜/铝复层板成形性能优于未退火时的性能;铜/铝复层板发生失稳断裂时,界面产生脱离。     

热处理条件下激光原位合成高铌Ti-Al金属间化合物复合涂层的微结构特征

为了提高钛合金的高温抗氧化性能,推动钛合金在高温和复杂工况环境下的进一步工程应用,利用高能激光束作用下Ti、Al、Nb三种元素混合粉末之间的原位反应在BT3-1钛合金表面制备了高温抗氧化的高铌Ti-Al金属间化合物复合涂层。针对原位反应所制备涂层存在的缺陷,通过自行设计的热处理工艺优化了涂层和界面微观组织。借助光学显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)分析了热处理前后复合涂层的物相结构及显微形貌。结果表明:热处理前的涂层主要由单质Nb、金属间化合物γ-TiAl、α_2-Ti_3Al、Ti_3Al_2等物相组成;热处理后的复合涂层,单质Nb固溶到γ-TiAl和α_2-Ti_3Al中,同时形成了新相Ti_3AlNb_(0.3),涂层近似为γ-TiAl+α_2-Ti_3Al双相层片状等轴晶组织。此外,涂层中并未观察到减弱抗氧化性的单质Nb颗粒和Ti_3Al_2相,Ti、Al、Nb的宏观偏析得以消除,涂层与基材界面位置的气孔和裂纹均以消失,出现了明显的白亮带冶金结合过渡层,涂层组织也更加均匀致密。热处理对提高钛合金表面Nb的合金化程度和改善Ti-Al金属间化合物的高温抗氧化性能起到了显著的促进作用。     

Interfacial Morphology and Bonding Mechanism of Explosive Weld Joints

Interfacial structure greatly affects the mechanical properties of laminated plates.However,the critical material properties that impact the interfacial morphology,appearance,and associated bonding mechanism of explosive welded plates are still unknown.In this paper,the same base plate(AZ31B alloy)and different flyer metals(aluminum alloy,copper,and stainless steel)were used to investigate interfacial morphology and structure.SEM and TEM results showed that typical sine wave,wave-like,and half-wave-like interfaces were found at the bonding interfaces of Al/Mg,Cu/Mg and SS/Mg clad plates,respectively.The different interfacial morphologies were mainly due to the differences in hardness and yield strength between the flyer and base metals.The results of the microstructural distribution at the bonding interface indicated metallurgical bonding,instead of the commonly believed solid-state bonding,in the explosive welded clad plate.In addition,the shear strength of the bonding interface of the explosive welded Al/Mg,Cu/Mg and SS/Mg clad plates can reach up to 201.2 MPa,147.8 MPa,and 128.4 MPa,respectively.The proposed research provides the design basis for laminated composite metal plates fabrication by explosive welding technology.     

Refill Friction Stir Spot Welding Al Alloy to Copper via Pure Metallurgical Joining Mechanism

The current investigation of refill friction stir spot welding(refill FSSW) Al alloy to copper primarily involved plunging the tool into bottom copper sheet to achieve both metallurgical and mechanical interfacial bonding. Compared to conventional FSSW and pinless FSSW, weld strength can be significantly improved by using this method. Nevertheless, tool wear is a critical issue during refill FSSW. In this study, defect-free Al/copper dissimilar welds were successfully fabricated using refill FSSW by only plunging the tool into top Al alloy sheet. Overall, two types of continuous and ultra-thin intermetallic compounds(IMCs) layers were identified at the whole Al/copper interface. Also, strong evidence of melting and resolidification was observed in the localized region. The peak temperature obtained at the center of Al/copper interface was 591℃, and the heating rate reached up to 916 ℃/s during the sleeve penetration phase. A softened weld region was produced via refill FSSW process, the hardness profile exhibited a W-shaped appearance along middle thickness of top Al alloy. The weld lap shear load was insensitive to the welding condition, whose scatter was rather small. The fracture path exclusively propagated along the IMCs layer of Cu_9Al_4 under the external lap shear loadings, both CuAl_2 and Cu_9Al_4 were detected on the fractured surface on the copper side. This research indicated that acceptable weld strength can be achieved via pure metallurgical joining mechanism, which has significant potential for the industrial applications.     

铝锡轴承合金双金属带制造技术的研究与应用

讨论了轴瓦用AlSn20Cu双金属带的特性和制造方法,经生产和使用结果表明,所用工艺方法能满足该类轴承的设计和使用要求.     

Eutectic bonding of austenitic stainless steel 316L to magnesium alloy AZ31 using copper interlayer

The eutectic bonding of magnesium alloy (AZ31) to austenitic stainless steel alloy (316L) was performed using pure Cu interlayers. The effect of hold time on the microstructural developments across the joint region and the related effect on bond shear strength were studied at a bonding temperature of 530°C. The bonding process took place through a sequential occurrence of solid-state diffusion of Cu into the magnesium alloy, eutectic phase formation, interlayer dissolution, and isothermal solidification. A (Mg–Cu–Al) ternary intermetallic phase formed within the joint and concentrated into the center of the bond during the solidification stage increasing the hardness value to a maximum average of VHN313 while the maximum recorded bond shear strength was 57 MPa achieving 69% of the AZ31 shear strength and about three to four times of the adhesive joints.