钢铁与超合金用的耐用、低成本保护涂层

美国太平洋西北国家实验室开发出一种陶瓷基涂层材料，可用于钢铁、超合金防腐、抗氧化、防碳化、防硫化等以确保其在气体、液体、蒸气及其他有害环境中的应用。这种涂层与金属结合紧密，在很低温度下产生有弹性的、廉价的、简单的防护层，而一般的陶瓷保护层则需要更高的温度。涂料的制造方法是：将铝金属粉末与液体陶瓷前驱聚合物混合形成浆料，而后用浸渍、涂刷或空气喷雾法涂布。利用市售钌催化剂形成的低温凝固工艺令聚合物凝聚而使浆料干燥形成新涂层。     

低密度单晶超合金抗蠕变

美国宇航局格林研究中心开发出一种涡轮发动机叶片用低密度单晶合金，具有良好抗蠕变特性。其目标是开发出一种密度比PWA1484合金低3％～6％，而抗蠕变强度要超过ReneN5合金的新品种。     

Thermal—Mechanical Fatigue Behavior and Life Analysis of Cast Ni—base Superalloy K417

In-phase(IP) and out-of-phase(OP)thermal-mechanical fatigue(TMF) behavior of cast Ni-base superalloy K417 was studied.All experiments were carried out under total strain control with temperature cycling between 400-850℃.Both in-phase and out-of-phase TMF specimens exhibited cyclic hardening followed by cyclic softening at the minimum temperature.Besides,they cyclically hardened in the early stage of life followed by cyclic softening at the minimum temperature.Besides,they cyclically hardened in the early stage of life followed by cyclic softening at the maximum temperature.OP TMF life was longer than of IP TMF.Various damage mechanisms operating in different controlled strain ranges and phasing were discussed.A few life prediction methods for isothermal fatigue were used to handle TMF fatigue and their applicability to superalloy K417 was evaluated.The SEM analysis of the fracture surface showed that transgranular fracture was the principal cracking mode for both IP and OP TMF.Oxidation was the main damage mechanism in causing shorter fatigue life for IP TMF compared with OP TMF.     

镍基耐热超合金的TLIM扩散焊接及其新发展

镍基耐热超合金的ＴＬＩＭ扩散焊接及其新发展镍基超合金，以其具有极高的抗热性和优良的耐腐蚀性而广泛应用在航空、航天、石油、化工工业中，其中的一些材料是制造飞机喷气发动机、火箭发动机、汽轮机中在极高温度下工作的零件的基本材料。然而，这类材料在采用熔焊方法...     

日本超高温结构用金属材料的研究现状

简要介绍了日本围绕燃气轮机用关键超高温金属结构材料所展开的研究开发工作,包括Ni基超合金、耐热金属间化合物、Nb基超合金及其复合材料。Ni基超合金仍是当前燃气轮机用超高温结构的主要材料,但其使用温度的上升潜力已经不多,用新的超高温材料替代Ni基超合金是燃气轮机用材的发展趋势,金属材料中耐热金属间化合物和Nb基复合材料是今后关注的焦点。     

PROPERTIES, WELDABILITY AND APPLICATIONS OF ADVANCED WROUGHT SUPERALLOYS FOR GAS TURBINE ENGINES

Alloy selection and alloy design both require consideration of an array of material attributes, including in-service properties, weldability and fabricability. Critical properties of advanced wrought superaUoys for gas turbine applications include high temperature strength, thermal stability, oxidation resistance and fatigue resistance. In this paper, the properties of twelve wrought solid-solution-strengthened and six age-hardenable superalloys are compared. Weldability is an important attribute and can be a major limiting factor in the use of certain alloys. Weldability test methods are discussed and the resistance of alloys to solidification cracking and strain-age cracking is compared. The use of weldability testing in the development of modern wrought superalloys is discussed with several examples cited. Finally, alloy selection for gas turbine components is outlined, taking into account both alloy properties and fabricability.     

用超合金作粘结相的硬质合金的TEM研究

用透射电子显微镜研究了由一种Ni基超合金作粘结相的硬质合金的组织结构。结果表明，烧结后合金的粘结相γ中分布着高度弥散的γ＇相。γ＇相质点在位错网络的结点上择优形核，形貌有粒状和片状两种，大小为10um数量级。观察表明，粘结相γ与WC的湿润性良好，因此用Ni基超合金作硬质合金的粘结相，不仅可节约战略物质Co，而且有可能使硬质合金的性能提高，使用范围扩大。     

一次时效温度对先进Ni基超合金蠕变强度的影响

为了提高喷气发动机涡轮叶片等用的Ni基单晶超合金（以下简称Ni基超合金）的使用温度，开发了添加Re等重元素和Ru等贵金属的第4、第5代Ni基超合金，其中第4代合金TMS-138A以及第5代合金TMS-196具有最优良的性能，有望在今后用于喷气发动机涡轮。     

重装精英骑士 华硕ENGTX560DCⅡTOP/2DI/1GD5显卡

GTX560虽然去掉了"Ti",但这似乎也为GF114显示核心卸下了沉重的包袱,不仅让它在售价上变得更具亲和力,同时也让它获得了更多的非公版改良空间,成为一款真正贴近游戏玩家、贴近主流用户的高效能显卡。本期亮相的华硕ENGTX560DCⅡTOP/2DI/1GD5则正是新近GTX560骑士团里的精英。     

超合金，显卡供电设计的创新：华硕EAH6870 DG/2D12S/1GD5 显卡

显卡的供电设计与显卡的稳定、超频性能息息相关,因此一直以来,显卡厂商都非常重视显卡的供电设计,进行了大量的创新设计。几乎所有玩家耳熟能洋的热门显卡产品无一例外郡将其供电设计作为产品的最大卖点之一。这类产品的供电设计确实比普通产品更出色,但引门仍然存在一些问题。本文介绍的华硕显卡在供电设计上进行了前所未有的创新设计,大大加强了产品的稳定性。