靳惠明
,
李铁藩
,
李美栓
中国腐蚀与防护学报
研究了Co-40Cr(wt%)合金在空气中、1000℃下的恒温氧化行为。通过SEM/EDXA等测试手段,对合金表面形成的氧化膜进行了分析。并且,与合金表面离子注入3×10 16Y+和3×10 17Y+/cm2后的氧化行为进行了比较。结果表明,注钇和未注钇样品氧化后表面形成的都是纯Cr2O3膜,离子注钇明显改善了合金的氧化性能。其原因主要是稀土钇能以离子或细小氧化物颗粒的形成偏聚于Cr2O3晶界,通过阻碍氧化膜中Cr3+阳离子向外扩散,降低了氧化膜的生长速率。同时,通过阻碍氧化膜/合金界面附近“kirkendall"空洞的形成,增强了氧化膜与合金基体之间的结合强度,提高了氧化膜的粘附性及合金的抗氧化性能。
关键词:
Co-Cr合金
,
oxide scale
,
rare earth effect(REE)
,
ion implantation
胡智杰
物理测试
本文研究了Mo、Co、Nb等元素离子注入及薄膜沉积方法对TiN薄膜性能的影响。采用SRV磨损实验、表面形貌轮廓等方法研究分析了离子注入对TiN薄膜的摩擦系数、耐磨性能、显微硬度的影响规律。实验结果表明:磁过滤电弧镀的TiN薄膜的摩擦系数曲线与常规电弧镀TiN薄膜的摩擦系数曲线相差很大,且耐磨性能优于电弧镀TiN薄膜。采用离子注入可降低TiN薄膜的摩擦系数。在5N载荷磨损条件下,随注入剂量和注入元素的不同其摩擦系数变化较大。在30N载荷磨损条件下,样品摩擦系数均接近0.5。离子注入Mo、Co、Nb均可显著提高TiN薄膜的耐磨性,其中注入Mo的试样耐磨性最好。
关键词:
TiN
,
ion implantation
,
friction
,
wear
研究TiAlN薄膜离子注入层的微观结构梁旺胜,陶冶,刘红亮
物理测试
利用磁过滤阴极电弧镀在硬质合金上沉积厚度约2~3 μm的TiAlN薄膜,并用MEVVA源离子对TiAlN薄膜注入金属离子V+和Nb+。应用北京同步辐射装置(BSRF)的同步辐射光源,采用掠入射X射线衍射(GIXRD)的方法对TiAlN薄膜表面离子注入层的微观结构进行分析研究。结果表明:未经过离子注入的TiAlN薄膜主要组成相是没有择优取向的Ti3AlN伴有少量AlN,而较小剂量(1×1017 ions/cm2)的离子注入都可以使Ti3AlN产生(111)上的择优取向和细化晶粒,且AlN消失;当离子注入的剂量达到5×1017 ions/cm2时,注入V+的Ti3AlN择优取向变为(210),并产生TiN相;注入Nb+ 的各个衍射峰完全消失,说明TiAlN薄膜表面离子注入层被非晶化,结合透射电镜的研究结果,观察到非晶层的厚度约为80~100 nm。
关键词:
同步辐射
,
grazing incidence
,
Xray diffraction
,
ion implantation
,
TiAlN films
徐景阳
,
VANBRUSSELBJ
,
NOORDHUISJ
,
BRONSVELDPM
,
DEHOSSONJThM
金属学报
AISI 304奥氏体不锈钢表面经激光熔化处理,引入一个大的张应力,它可用注Ne的方法使其缓解本文介绍测量0.1μm薄层应力变化的原理和技术,由测得的应力分布曲线证明了注Ne缓解表面张应力的效果
关键词:
X射线衍射
,
stress relax
,
ion implantation
,
laser melting
虞忠良
,
李守新
,
刘羽寅
,
张庆瑜
,
雷家峰
,
牟忠信
材料研究学报
采用喷丸和离子注入对Ti--6--22--22合金机械加工样品进行表面处理,
研究表面处理对Ti--6--22--22合金室温和高温疲劳寿命的影响. 结果表明,
喷丸和离子注入对材料疲劳$S$--$N$曲线的影响与实验温度有关.
喷丸和离子注入对Ti--6--22--22合金的室温疲劳强度影响较小,
400℃时的疲劳强度明显提高. SEM断口分析显示,
400℃长寿命疲劳后的表面处理样品裂纹在亚表面萌生.
关键词:
金属材料
,
Ti-6-22-22 alloy
,
shot-peening
,
ion implantation
,
S-N curves
WANG Jian WU Xingfang CHEN Xunping CAI Jun University of Science and Technology Beijing
,
Beijing
,
China LIU Baixin Tsinghua University
,
Beijing
,
China FANG Zhengzhi Beijing Institute of Space Physics
,
Academia Sinica
,
Beijing
,
China
金属学报(英文版)
Co thin films were subjected to 50 keV carbon ion implantation.At the dose of 2.5× 10~(17)/cm~2,a hexagonal Co-carbide phase was observed for the first time.The lattice con- stants from electron diffraction are a=0.2685 nm and c=0.4335 nm.The phase does not dis- appear until the dose of 9×10~(17)/cm~2.Auger spectra showed that the stoichiometry was Co_(2-3)C.The behavior of the ferromagnetic carbides along the descending sequence of Ni-Fe-Co by Fermi energy of solids was interpreted.Furthermore,based on the kinetic con- dition of phase transformation and the band theory of solids,a possible explanation about the difference of the results of ion-metallurgy and thermal metallurgy was proposed.
关键词:
ion implantation
,
null
,
null
,
null
,
null
CHEN Lifan BA Tu SHI Changxu State Key Laboratory for Fatigue and Fracture of Materials
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China Doctorate Student.Institute of Physics.Academia Sinica
,
Beijing 100080
,
China
金属学报(英文版)
50 keV B~+ ions was implanted to polycrvstalline with 50 keV B~+ to a dose o/ 3x 10~17 ions/cm~2 at room temperature.The specimens with and without B~+implantation were tested in micro-hardness and load or unload tensile fatigue under stress-controlled eondition. The surface layer structure was observed with IMA,SEM and TEM before and after implantation and/or fatigue.The B~+ implanted surface region consists of amorphous Ni-B phase,Ni_3B and Ni_4B_3 second phases,and damage structure.The corresponding measurements indicate that both surface micro-hardness and endurance limit of the specimens have increased after implantation.Compared with unimplanted specimens under the same fa- tigue condition,all implanted specimens show the smallest overall fatigue danage.The cyclic loading at room temperature can lead to migration of implanted B~+ out surface layer and reerystallization of amorphous Ni-B phase,Possible strengthening mechanisms.for these ex- perimental results were discussed.
关键词:
ion implantation
,
null
,
null
,
null