支持产品工程分析的集成产品模型

本文分析了基于产品几何模型、装配信息，支持产品工程分析的集成产品模型描述。该模型在产品几何模型和装配模型的基础上集成了零部件设计参数、参数之间的约束关系、受力状况、力学性能。阐述了Pro/Engineer平台应用系统原理。     

铝合金车身框架制造中的热加工新技术

在分析铝合金空间框架结构的发展背景和应用前景的基础上，论述了铝合金空间框架结构制造中的几种新技术：内高压成形技术、触变铸造技术及激光焊接技术。着重介绍了这些新技术的原理、工艺特点及其在汽车工业中的应用现状。     

Al、V微合金高强度船板的研究

采用Gleeble-1500热模拟试验机测试了2种微合金钢(Al、Al V)经1150℃加热、20％压缩变形条件下的显微组织状态，结果表明，Al、V复合强化的试验钢以2℃／s速度冷却时，钢中出现针状铁素体。冷却速度为5℃／s时出现贝氏体，而Al强化钢中出现针状铁素体的冷速要达到5℃／s，因此建议生产含V钢时冷速控制在1～5℃／s。     

倒装式表壳冲孔模设计

对于具有特殊技术要求的冲裁件而言 ,传统的常规模具结构不能满足冲裁质量的要求 ,设计的倒装式模具结构解决了这一特殊的冲裁工艺     

Mechanical properties and microstructures of hot extruded AE42 alloy with addition of zinc

Mechanical properties and microstructures of AE42 magnesium alloy with addition of Zn and subjected to hot extrusion at 370 ℃ and an extrusion ratio of 8：1 were investigated. The results show that for the AE42 alloy, the addition of Zn can obviously improve its elongation as well as the ultimate tensile and yield strengths below 150 ℃. The addition of Zn can refine the mierostructure of the AE42 alloy, and result in the precipitation of Mg17Al12 and MgZn2 phases. Due to the addition of Zn to the AE42 alloy, the amount of Al11RE3 phase decreases, while the Al11RE3 phase becomes short rod-shaped from acicular and block, and distributes along the grain boundaries, which will have a stronger effect on the tensile properties of the alloy at elevated temperature. In addition, with the presence of MgZn2 precipitates, the sliding of grain boundaries is restrained and the strength of the alloy gets enhanced.     

Crystal structure and switchable optical properties of yttrium hydride films covered by palladium layer

1　INTRODUCTIONTherare earthhydridefilmswithswitchableop ticalpropertieswerefirstlydiscoveredbyHuibertsetal[13] andhaveattractedmoreandmoreinterestre cently .Huibertsetal[1,2 ] foundthatthefilmsofYHxandLaHx exhibitremarkablereversiblechangesintheiropticalpropertiesduringhydrogenation/dehy drogenationprocess .Bychangingthehydrogen gaspressureorbyelectrochemicalmeans,thefilmscanbecontinuouslyandreversiblyswitchedfromashinymirrortoatransparentwindowinafractionofasec ond[3,4 ] .Thesubsequen…     

聚氧化乙烯改性水玻璃粘结剂的研究

确定了聚氧化乙烯改性水玻璃粘结剂的基本组分,测试了有机酯自硬和CO2气硬型砂的常温粘结强度和高温残留强度。研究发现,在水玻璃中加入聚氧化乙烯树脂能改善水玻璃的老化现象,充分发挥其粘结效率;粘结剂加入量相同时,型砂强度是普通水玻璃砂的1.5倍,800～1000℃时,型砂残留强度≤0.5MPa。结果表明,聚氧化乙烯改性水玻璃粘结剂加入量低,型砂工艺性能良好,浇注后出砂容易,有利于旧砂进一步干法回用。     

Effects of deformation on microstructures and properties of submicron crystalline Cu-5%Cr alloy

Warm extrusion of submicron crystalline Cu-5%Cr from 100 ℃ to 600 ℃ was investigated. The effects of different extrusion ratios and different extrusion temperatures on microstructures and properties of submicron crystalline Cu-5%Cr were studied. The microstructures of the extruded Cu-5%Cr were characterized by backscattered electron irnages（BSE） and transmission electron microscopy（TEM）. The mechanical properties of the extruded Cu-5%Cr were measured by means of microhardness and tension test. The results show that, the deformation, dynamic recovery and dynamic recrystallization of the extruded Cu-5%Cr are mainly produced in Cu matrix. The higher extrusion ratio leads to more uniform microstructure and finer Cu grains. When being extruded in the range of 100-600 ℃, dynamic recovery of Cu is the dominant process, and dynamic recrystallization of Cu occurred above 300 ℃ is far from end. The most part of microstructure of as-extruded Cu-5%Cr is subcrystaUines produced by dynamic recovery, only a few recrystallines exist, and the average size of these grains is not larger than 400 nm. With extrusion temperature rising, the tensile strength and microhardness of Cu-5%Cr decrease, and elongation increases gradually.     

X70与CF62异种钢焊接工艺

通过对X70和CF62钢焊接接头低温冲击试验和组织的测定，结合“西气东输”工程站场内焊接施工的实际要求，研究了以上两种材料的异种钢焊接要点，该工艺已作为“西气东输”工程站场内的焊接工艺方案，并可为异种钢管的焊接提供可靠的技术参考。     

电化学扫描探针显微镜在腐蚀电化学研究中的应用

从电化学扫描探针显微镜（ECSPM）的工作原理出发，综述了近几年电化学扫描探针显微镜在腐蚀电化学领域的研究进展，指出电化学扫描探针显微镜在原位，局部腐蚀，腐蚀早期过程等电化学中有重要的应用价值。