白彬
,
张鹏程
,
邹觉生
兵器材料科学与工程
doi:10.3969/j.issn.1004-244X.2001.05.015
利用光学显微镜、电子显微镜、俄歇电子谱/二次离子质谱表面分析仪等结合拉伸实验,研究了00Cr17Ni14Mo2奥氏体不锈钢及其电子束焊缝在650℃充氘后组织、微区成分变化与性能的关系,以及拉伸应力与氘分布的关系.结果表明,高温气相充氘后,00Cr17Ni14Mo2奥氏体不锈钢及其电子束焊缝抗氢脆性能较明显下降.晶界、孪晶界析出大量的碳化物,但拉伸断口形貌并未呈沿晶断裂;晶界上未发现S、P等痕量元素的偏聚,却产生了富G、Mo而贫Ni层,这表明晶界成分的变化减弱了晶界析出物对氢脆的影响.电子束焊缝塑性下降,拉伸时从该处断裂.拉伸静水应力梯度分布导致氘在拉伸试样断口处富集.
关键词:
00Cr17Ni14Mo2不锈钢
,
氢脆
,
电子束焊缝
,
高温
,
AES
,
SIMS
刘平
,
蒋益明
,
谢亨博
,
郭峰
,
李劲
材料研究学报
doi:10.3321/j.issn:1005-3093.2004.06.008
研究了用真空分层蒸镀法获得的金属/有机双层膜(Ag-TCNQ)中的层间扩散行为.根据Cu、Ag在与TCNQ形成络合物时表现出的相似性,建立了异质元素标志法,以Cu为标志元素,研究了金属有机络合物Ag-TCNQ形成过程中Ag扩散的微观机制.使用二次离子质谱(SIMS)分析了Cu、Ag元素在不同样品膜中的浓度分布及变化情况.结果表明,不同于纯金属薄膜中Cu、Ag清晰的界面,在络合物中的Cu与Ag之间存在交叉,说明两种离子之间存在着交换现象.由此可以推断,薄膜中的扩散机制是Ag离子在Ag-TCNQ络合物中的换位扩散.
关键词:
材料科学基础学科
,
换位扩散
,
异质元素标志法
,
SIMS
,
Ag-TCNQ薄膜
姜洪刚
,
丁炳哲
,
王景唐
金属学报
利用二次离子质谱(SIMS)并结合离子剥落研究了Al原子在非晶Fe_(78)Si_9B_(13)合金中的扩散。实验结果表明:在320-380℃温区内,扩散系数D位于2.43×10~(-22)-2.01×10~(-21)m~2s~(-1)之间,且它随温度的变化符合Arrhenius关系,D=D_0 exp(-Q/kT),其中指数前因子D_0=2.02×10~(-12)m~2s~(-1)。扩散激活能Q=1.17eV。
关键词:
非晶合金
,
atomic diffusion
,
SIMS
K.PrzybylskiS.ChevalierP.Juzoń
中国腐蚀与防护学报
This review is concerned with the effect of the addition of zirconium as a third element on the heat-resisting properties of Fe3Al intermetallic compounds and explains their high-temperature oxidation mechanism. The Fe3Al and Fe3Al-0.05Zr specimens were isothermally oxidized in the temperature range of 1173~1473 K in synthetic air for 100 h. The formation of the alumina layer approximately obeyed the parabolic rate law, with the exception of short initial stage. The parabolic rate constant values for the Zr-doped Fe3Al decreased at all tested temperatures. Fe3Al revealed massive spallation, whereas Fe3Al-Zr produced a flat, adherent oxide layer. The microstructure investigations of the alumina scales grown thermally on the Fe3Al-Zr alloy by means of SEM-EDS showed that they were 1.5~2 μm thick and consisted of a small inner columnar layer and an equiaxed outer grain layer. Additionally, very fine (50~150 nm) oxide particles rich in Zr were found across the alumina scales. The addition of Zr significantly affected the oxidation behavior of Fe3Al by improving the adherence of the α-Al2O3 scale. TEM-SAD investigations of the alumina scales on samples prepared using the FIB (Focused Ion Beam) method confirmed the presence of small tetragonal zirconia grains near the scale/gas and alloy/scale interfaces, most of which were formed along alumina grain boundaries(gbs). Zr gb-segregation was found using HRTEM. The role of preferential formation of zirconium oxide along the alumina scale grain boundaries and the effect of Zr gb-segregation on oxidation and scale growth mechanisms were analyzed by means of two-stage oxidation experiments using 16O2/18O2. The SIMS oxygen isotope profiles for the Fe3Al-Zr alloy oxidized at 1373 K,\linebreak after two-stage oxidation experiments, revealed that oxygen anion diffusion is predominant compared to that of aluminum cation diffusion.
关键词:
alumina scales
,
null
,
null
,
null
,
null
王菊琳
,
许淳淳
,
于淼
中国腐蚀与防护学报
青铜在模拟环境介质中的循环伏安实验及XRD测试结果表明，氧化过程主要为生成有害锈CuCl的过程，还原过程主要为CuCl还原成纯铜晶粒的过程，并且反应电流较大，对青铜基体的破坏性较大.运用高性能二次离子质谱(SIMS)观测到不同腐蚀电位下青铜表面腐蚀产物中均含有Cu、Sn、Cl、O、C、S元素，阴离子相对含量由大到小为Cl、O、C、S；腐蚀产物层由表及里Cu/Sn值始终小于合金中Cu/Sn，并且Cu离子含量基本不变，Sn离子含量有起伏，Cl、O离子含量有所下降.
关键词:
二次离子质谱
,
archaeological bronze
,
environment
,
corrosion
