5083和7020变形铝合金加工图的研究

在动态材料模型理论基础上,对5083和7020两种典型变形铝合金的加工图进行研究分析,结果表明:5083铝合金适宜加工区的温度为450～500℃、应变速率为0.005～0.1s-1;7020铝合金适宜加工区的温度为450～550℃、应变速率为0.001～O.1s-1.同时通过选取7020铝合金在不同加工条件下的压缩试样...     

真空磁动力装置在高强度变形铝合金熔炼和铸造中的应用

用真空磁动力装置和新型工艺制备高强度变形铝合金可以获得良好效果。与传统工艺相比,合金中氢含量降低65%~80%,从而提高了产品的内部质量和力学特性。应用真空磁动力装置半连续铸造 142 mm铸锭和二次АД31合金回炉料,其性能与采用新原材料制备的合金性能相当。     

变形镁合金中的织构及其优化设计

针对变形镁合金存在的典型织构以及织构优化设计方面的研究工作和进展进行综合评述。镁合金由于基面滑移和{1 012}孪生是最容易开动的变形模式,在变形镁合金中容易形成挤压丝织构及轧制板织构。通过引入剪切变形,改变成型过程中外加应力的取向,能够有效地改变变形镁合金的织构,同时通过添加微量稀土元素Nd、Ce和Y等,能够明显弱化或随机化变形镁合金织构。织构随机化后的镁稀土合金具有较好的强韧性,合金的变形各向异性得以改善。添加稀土元素后会改变稀土元素与Mg原子间的键能,改变稀土元素周围Mg-Mg原子之间的结合能等,增加非基面滑移的可能性,减弱基面滑移及{1 012}孪生所占的比率,有效地弱化镁合金的织构。     

立式半连续铸造技术进展

围绕铸造机、结晶器的发展对半连续铸造技术进行归纳,提出热顶铸造和同水平铸造是当前的发展方向。结合凝固过程以及传热分析,讨论向上导热距离、向下导热距离、铸造速度、结晶器有效高度等关键参数的影响规律,测量和估算连续铸造过程中的各种物理量、界面参数的方法。指出结合模拟仿真技术、大数据技术等建立的连续铸造工艺参数专家系统,将是未来的研发重点。     

欧盟对航空航天器变形镁合金应用的评估

回顾了变形镁合金的生产与在航空器方面的应用。2005年～2008年欧盟在PF6框架内进行了一个名为"AEROMAG"的研究计划,对现行变形镁合金的加工性能、成形工艺、表面处理、燃烧性能、连接工艺与结构性能等作了精心的评价,没有一个镁合金的各项性能可全面与5083及2024-T3铝合金的相抗衡,镁合金现在还没有取代航空铝合金的可能性。     

变形铝及铝合金状态代号体系研究

论述了我国变形铝及铝合金状态代号体系的状态，采用美国状态的依据，可行性及国外状态的发展趋势。并结合生产实际，对热处理状态和加工硬化状态进行了研究，为今后生产同类状态的产品提供生产实践依据。     

对建设大型再生铝合金板带厂的设想

在有色金属结构材料中旧铝废料具有最高的可再生利用性,最大限度地回收废旧铝与充分有效地加以再生利用,是建设节约型社会与环境友好型社会的重要一环,是又好又快建设可持续发展铝工业的必由之路。笔者首次提出中国有必要建设大型再生铝合金板带厂的建议。从各方面探讨建厂的可行性,在长江三角洲或珠江三角洲地区建一个生产能力180 kt/a的再生铝合金板带厂,在资源、能源、技术、经济、环保、市场、政策、国际环境等方面都是可行的。产品种类为再生1×××、3×××、5×××系铝合金民用板带。     

Research on novel cast and wrought superalloy FGH4096 for aircraft turbine disk applications

The ingot metallurgy of electro- slag remelting continuous directional solidification(ESR- CDS) followed by multiple forging and isothermal forging, a novel cast and wrought(C&W) routes for preparation of FGH4096 turbine disk, was developed to solve the difficulties of microstructure controlling, the macro- segregation, poor processing of ingot with high alloying element used for the turbine disk of advanced aircraft engine. From aspects of ingot microstructure characteristics, hot working plasticity, microstructure controlling, mechanical properties and strengthening mechanisms, the preparing processes of C & W superalloy FGH96 turbine disk were studied. The formation of bulk ?? phase, borides phase and carbonitride strips can be avoided by the directionally solidified ingot, which resulted in excellent hot working plasticity. Multiple forging was applied to achieve the homogeneity of microstructure. The grains are fine in different parts of the billet, and the deformation dead zone can be eliminated. The mean grain size for alloy billet is close to ASTM 9-10. Because of the fine grains and the homogeneity of microstructure, the ultra- inspection capability for disk forging can be significantly improved. With the increase of solution temperature, the yield strength decreases. Under sub- solvus temperatures, the creep resistance decreases with the increase of solution cooling rate. The micro- twining shearing is the main creep deformation mechanism for the samples from disk rim.     

Analysis on flow stress of magnesium alloys during high temperature deformation

The flow stress of magnesium alloys during hot compression at different temperatures and strain rates was studied by experiments.Materials used were AZ91D alloys in as-cast,homogeneous treatment states,AZ31 and ZK60 alloys in as-cast state. The results show that the thermal simulation curves of different alloys differ from one another at the same deforming condition.The general curves of AZ31 and AZ91D alloys have the character of dynamic recrystallization.There are increase of true stress,drastic fallin...