材料期刊网

HARDENING OF L1_2-ORDERED Co_3Ti BY PRECIPITATION OF FCC-Co PHASE

W. H. Tian , S.L. Hu and M. Nemoto(Department of Materials Physics , University of Science and Technology Beijing , Beijing 100083 , China)(Department of Materials Forming , University of Science and Technology Beijing , Beijing 100083 , China)(Department of Materials Science and Engineering , Faculty of Engineering , Kyushu University , Fukuoka 812 , Japan)

金属学报(英文版)

The Co3 Ti phase hardens appreciably by the fine precipitation of disordered fcc Co-rich phase upon aging after quenching from solution annealing temperature. Transmission electron microscope (TEM)observations revealed that the precipitates are platelet in shape, lying nearly parallel to the {100} planes of the L12-ordered matrix, and perfectly coherent with the matrix lattice at the beginning of aging. The high temperature strength increases appreciably with the fine precipitation of disondered Co-rich phase over the whole temperature range investigated. TEM observations of the deformed alloys after underaging revealed that saperdislocations are pinned by precipitates indicating an attractive interaction between dislocations and precipitates.

关键词: Co_3 Ti , null , null , null , null

Mg掺杂AlInP限制层窗口结构高功率(3.7 W) 660 nm AlGaInP宽面半导体激光器

马德营 , 李佩旭 , 夏伟 , 李树强 , 汤庆敏 , 张新 , 任忠祥 , 徐现刚

人工晶体学报

本文采用低压金属有机化学气相沉积系统(LP-MOCVD)生长出Mg掺杂压应变分别限制多量子阱结构的AlGaInP/GaInP 660 nm LD外延材料,制作出腔长1000 μm、条宽150 μm的宽面半导体激光器.采用选择性Zn扩散在管芯两端面区制作出透明窗口结构来提高器件的腔面光灾变阈值(COD).透明窗口结构激光器最大连续输出功率为3.7 W,是正常结构的激光器COD饱和功率的4.4倍.激光器的特征温度T0为68 K,热阻为4.6 K/W.在热沉温度为20 ℃时进行了500 mW恒功率老化,老化时间为1000 h.

关键词: 窗口结构 , Zn扩散 , 热阻 , AlGaInP , 半导体激光器

C和W注入H13钢纳米结构和抗腐蚀特性

张通和 , 吴瑜光 , 易仲珍 , 张旭 , 梁宏 , 马芙蓉 , 王晓妍

材料热处理学报 doi:10.3969/j.issn.1009-6264.2001.03.015

用多次扫描电位法研究了C和W单独及双注入H13钢对抗腐蚀特性的影响、抗腐蚀相生成的条件及其对抗腐蚀特性的作用,对改性机理进行了讨论.实验结果表明,碳、钨单独和双注入H13钢钨和碳可在注入层超饱和分布,特征为类高斯分布.双注入可在注入层中形成弥散的碳化钨WC和W2C、中间相Fe2W、铁钨碳化物FeW3C、Fe6 W6C和铁的碳化物Fe5C3,Fe3C,Fe2C等.其形状为丝状纳米相,丝状相沿样品法线生长.这种结构使注入层强化,增强了表面抗腐蚀特性;钨和碳双注入同时具有钨和碳单注入的优势,能更有效地提高H13钢的抗腐蚀性,随着W和C注入剂量的增加,抗腐蚀特性逐步增强;样品W5C5的Jp经55个周期腐蚀后,约为H13钢Jp的1/30.

关键词: C和W注入 , 钢 , 抗腐蚀特性 , 电化学测量

LF炉冶炼过程钢中w(H)控制的实践

王瑾 , 廖明 , 李斌

钢铁研究

在2008年重钢的探伤钢CDQ207生产中,钢中氢成为影响钢板探伤合格率的主要因素之一.通过加强合金烘烤、控制精炼环节原辅料水分等技术管理措施,强化LF过程w(H)控制,充分发挥LF精炼功能,确保了大部分炉次钢中w(H)控制在合理范围内.2009年1-10月探伤钢探伤综量合格率为95.93%,较好地完成了项目指标.

关键词: 探伤 , 控氢 , LF , 合金烘烤

不同金属基体上W-C:H溅射薄膜的摩擦学性能

郑军 , 周晖 , 杨拉毛草 , 张延帅 , 翟广泉

宇航材料工艺 doi:10.3969/j.issn.1007-2330.2015.01.015

采用非平衡磁控溅射技术在40Cr、9Cr18、GCr15、TC4及LY12等5种金属基体上沉积了钨掺杂含氢类金刚石(W-C:H)薄膜.采用Raman光谱仪、扫描电子显微镜、纳米硬度计及纳米划痕仪分别测试了薄膜的微结构、厚度、硬度及附着力,采用球-盘摩擦试验机及光学轮廓仪分别在干摩擦和PFPE脂润滑条件下评价了5种金属材料基体上薄膜的摩擦磨损性能.薄膜性能测试结果显示,该厚度为1μm的薄膜具有典型的类金刚石结构,硬度与弹性模量分别为11.56和128.34 GPa,附着力为645 mN;摩擦试验结果显示,在干摩擦条件下几种金属基体表面W-C:H薄膜的摩擦因数和磨损率差别比较显著,而在脂润滑条件下基体材料的影响较小;与干摩擦条件相比,脂润滑条件下薄膜的磨损可减少60％ ～75％;在干摩擦与脂润滑条件下,9Cr18与40Cr基体上的W-C:H薄膜摩擦体系分别具有最小的磨损率1.71×10-7 mm3/(N·m)及4.55×10-8 mm3/(N·m).

关键词: W-C:H薄膜 , 摩擦学 , PEPE润滑脂 , 力学性能 , 非平衡磁控溅射

H13、3Cr2W8V和1.2367热疲劳性能的对比研究

陈英伟 , 吴晓春

钢铁研究学报

采用自约束热疲劳试验方法分别对H13、3Cr2W8V和1.2367钢进行热疲劳试验,对比分析表面裂纹形貌与截面裂纹深度,计算热疲劳损伤因子.利用Gleeble-3500对材料进行高温抗压实验,并对材料的组织进行SEM观察和EDS分析,研究热疲劳裂纹的萌生、扩展与材料强度和韧性的关系.研究表明:1.2367钢热疲劳后,表面裂纹十分均匀、细小,没有形成主裂纹,其热疲劳抗力高于H13钢和3Cr2W8V.1.2367较高的强度提高了材料热疲劳裂纹萌生的抗力,材料的热疲劳性能不仅取决于强度与硬度,也取决于良好的冲击韧性.

关键词: H13 , 3Cr2W8V , 1.2367 , 热疲劳性能 , 损伤因子

H13、3Cr2W8V和1.2367热疲劳性能的对比研究

陈英伟 吴晓春

钢铁研究学报

采用自约束热疲劳试验方法分别对H13、3Cr2W8V和1.2367钢进行热疲劳实验，对比分析表面裂纹形貌与截面裂纹深度，计算热疲劳损伤因子。利用Gleeble－3500对材料进行高温抗压实验，并对材料的组织进行SEM观察和EDS分析，研究热疲劳裂纹的萌生、扩展与材料强度和韧性的关系。研究表明：1.2367钢热疲劳后，表面裂纹十分均匀、细小，没有形成主裂纹，其热疲劳抗力高于H13钢和3Cr2W8V。1.2367较高的强度提高了材料热疲劳裂纹萌生的抗力，材料的热疲劳性能不仅取决于强度与硬度，也取决于良好的冲击韧性。

关键词: H13;3Cr2W8V;1.2367;热疲劳性能;损伤因子

La对Ni-20Cr-18W-1Mo基高温合金1373K/100h氧化行为的影响

王健 , 袁亮 , 胡锐 , 张铁邦 , 李金山

稀有金属材料与工程

对有无La元素的Ni-20Cr-18W-1Mo基高温合金进行了1373 K/100h的等温氧化试验,分别采用扫描电镜(SEM),X射线能谱(EDX)和X射线衍射(XRD)分析了氧化试样的氧化膜表面和截面形貌特征.结果表明,La元素的添加能够极大地提高基体和氧化膜之间的结合力,使得Ni-20Cr-18W-1Mo基高温合金在1373 K时的抗氧化性提高,相比于未添加La元素的Ni-20Cr-18W-1Mo基高温合金,添加La元素的高温合金具有更小的抛物线氧化速率常数κ”和较弱的氧化膜剥落,同时,形成的表面氧化膜更加致密纤细.

关键词: Ni-20Cr-18W-lMo基高温合金 , 氧化 , La , 氧化膜 , 抛物线速率常数

Wetting phenomena in CuZr-based glassy alloys/W system

Journal of Alloys and Compounds

The wetting behavior and interfaces of CuZr-based glassy alloys/W system were investigated by the sessile drop method. It was found that Cu(50)Zr(50)/W, Cu(47.5)Zr(47.5)Al(5)/W and Cu(40)Zr(44)Al(8)Ag(8)/W system had the final equilibrium contact angle around 18 degrees, 8 degrees and 3 degrees at corresponding experimental temperatures. Base on the scanning electron microscopy observing, no reaction product can be found at the interface of Cu(47.5)Zr(47.5)Al(5)/W and Cu(40)Zr(44)Al(8)Ag(8)/W, and some granular reaction products appeared along the interface of Cu(50)Zr(50)/W. The present work indicates that Cu(47.5)Zr(47.5)Al(5) and Cu(40)Zr(44)Al(8)Ag(8) bulk metallic glasses (BMGs) are appropriate for the fabrication of W reinforced BMGs matrix composite. (C) 2010 Elsevier B.V. All rights reserved.

关键词: Wettability;Diffusion;Composite;Metallic glasses;bulk metallic glasses;mechanical-properties;matrix composites;compressive plasticity;amorphous-alloys;behavior;tungsten;al;solidification;deformation

Densification of the Tungsten Heavy Alloys at 1473 K and Fabrication of W-Mo System FGM with Density Gradient

Huaping XIONG , Lianmeng ZHANG , Junguo LI , Runzhang YUAN

材料科学技术（英文）

The tungsten heavy alloys with Ni-Al and Fe-Al additives were sintered by hot-press method at 1473 K for 1 h. It was found that the relative density of the W-Fe alloy could be increased evidently by addition of Al. However, the relative density of W-Ni-Al alloy with low content of Al was conversely decreased considerably compared with that of W-Ni alloy. The causes have been studied. The sintering experiments of Mo alloy and W-Mo alloys with 3 wt pct Fe-1.5 wt pct Al additives were also carried out under the same sintering condition of low temperature. Finally, W-Mo system FGM with density gradient was successfully fabricated. Its density changed gradually from 17.0´103 kg/m3 to 9.5´103 kg/m3 within the middle 1.1 mm thickness range.

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