Preparation and characterization of Ni/Co bimetallic nano-clusters

Ni/Co bimetallic nano-cluters have been prepared from the aqueous solution by reducing their corresponding metal salts under suitable conditions. The experimental conditions including the type and concentration of protective agent, feeding order and the pH of the solution that influence the average particle size have been studied in detail. Transmission electron microscopy (TEM) indicates that the shape of those bimetallic nano-cluster particles is spheroid. The alloy structure has been shown by X-ray powder diffraction (XRD). The X-ray photoelectron spectroscopic (XPS) data have confirmed that the nickel and cobalt in the bimetallic nano-clusters are in the zero-valence state.     

非晶Fe-Zr-B薄膜穆斯堡尔谱学研究

用X射线衍射分析、X射线光电子能谱(XPS)和穆斯堡尔谱学研究了直流磁控溅射法制备的Fe-Zr-B薄膜。X射线衍射分析结果表明制备态的薄膜是非晶的;X射线光电子能谱(XPS)结果表明样品表面氧化较明显,深层部分Fe, Zr, B结合占主导地位;穆斯堡尔谱学结果表明薄膜中Fe原子周围Zr、B原子的存在使Fe原子核内场值有所下降并导致超精细场分布P(H)出现双峰结构,薄膜中存在两种不同的局域微结构。     

快淬贮氢合金的活化性能与寿命

主要讨论了快淬钛基合金具有良好活化性能及较差循环寿命的机理。研究结果表明:快淬钛基合金电极浸泡在碱液中,合金元素V、Zr、Ti、Mn、Ni以不同速度溶解,其中Ni的溶解速度最慢,使合金电极表面富Ni。富Ni电极表面具有良好的动力学性能,快淬钛基贮氢合金的放电容量急剧衰退与损失大量可吸氢的V、Zr元素密切相关。     

铅基板栅合金综合性能探析

在Pb-Ca-Sn-Al合金的基础上尝试添加第五种合金元素，测试其电化学性能，并在理论上讨论了其性能提高的原因。     

RESEARCH ON A NEW FORGING TECHNIQUE—SHORT-HOLLOW-RAPID DIE FORGING

TherearethreeproblemsinTi--Alalloyforging:(1)Crystallinestructuredefects;(2)Highresistanceofdeformation;(3)Deepscratchesonthediescausedbytheforgedpiece.Thenewshort--hollow--rapiddieforgingtechniquewassuccessfullyusedinTCg,TCll,andTi679Ti--Alalloydieforging,andsolvedalltheseproblems.1THEPRINCIPLESOFSHORT~HOLLOWRAPIDDIEFORGING1.1ThePrincipleofShortDiesAccordingtotherelationsbetweentheforgingpressureandthepress--downshortages(seeFig.1),whenthepress--downshortagesarelessthan…     

Effect of AlP master alloy on grain refinement of primary silicon in eutectic Al-Si alloys

To obtain the finer primary silicon crystals, the proprietary Al-P master alloy was adopted to modify the eutectic Al-Si alloys and the most suitable modification process was made in the experiments. The SEM (Scanning Electron Microscope) and DSC (Differential Scanning Calorimeter) analysis indicate that the Al-P modifier has more advantages over Cu-P and Fe-P modifier in easily addition, no elemental alteration and less undercooling of primary silicon′s solidification, which suggests the Al-P master alloy is an effective modifier of eutectic Al-Si alloys.     

镁合金及镁基复合材料阻尼性能研究进展

简要介绍了纯镁、镁合金及镁基复合材料的位错型阻尼机理,叙述了温度、合金成分、组织结构和微观缺陷(包括晶界相界)以及热处理等因素对镁合金阻尼性能的影响.镁基复合材料较镁合金有较高的阻尼性能,是由于增加了多种阻尼机制的结果,其中最重要的是塑性区阻尼、位错密度的增大、界面滑移阻尼等.     

耐蚀高强动力弹簧合金3YC42的产品材料质量工程研究

就航天工程用耐蚀高强卫星动力弹簧合金3YC42进行了产品材料质量工程研究。确证了计算成份按固溶强化、形变强化和库尔纳阔夫状态强化的优化组合是从产品质量要求出发的最佳的成份，组织结构和性能质量工程控制．展示了我国设计与研制高科技领域所需材料及其质量控制的水平和能力。     

高能球磨LaNi5-34%(质量分数)Mg的相组成与热稳定性能

采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、差热分析(DTA)等方法研究了高能球磨及热处理等对新型合金LaNi5-34％(质量分数)Mg的相组成、形貌及热稳定性能等的影响。结果表明：经100r／min球磨100h及190r／min球磨100h后,样品由La、Mg、Ni等非晶。微量的晶体Ni和MgNi2相组成,所得粉末的形状大多为规则的球形或近球形,其颗粒直径范围为0．05～33．0μm。球磨样品具有较好的室温活化特性，其最大电化学放电容量为460mAh／g。该样品经763K保温35d后，得到热稳定性较好的具有纳米尺度的MgNi2、Mg2Ni、Mg2NiLa三相组织，其平均晶粒直径为21.3nm。     

铜及铜合金中铅的形态与热加工

文章描述了铅在双相铜合金中的存在形态及在热加工过程中的变化形为。讨论了含铅双相铜合金的热加工过程产生"热脆"的机理,为合理地选择和制定热加工工艺提出了相应的措施。