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21.
Ratio of Fe-Al compound at interface of steel-backed Al-graphite semi-solid bonding plate 总被引:1,自引:0,他引:1
The ratio of Fe-Al compound at the bonding interface of solid steel plate to Al-7graphite slurry was used to characterize the interfacial structure of steel-Al-7graphite semi-solid bonding plate quantitatively. The relationship between the ratio of Fe-Al compound at interface and bonding parameters (such as preheat temperature of steel plate, solid fraction of Al-7graphite slurry and rolling speed) was established by artificial neural networks perfectly. The results show that when the bonding parameters are 516 ℃ for preheat temperature of steel plate, 32.5% for solid fraction of Al-7graphite slurry and 12 mm/s for rolling speed, the reasonable ratio of Fe-Al compound corresponding to the largest interfacial shear strength of bonding plate is obtained to be 70.1%. This reasonable ratio of Fe-Al compound is a quantitative criterion of interfacial embrittlement, namely, when the ratio of Fe-Al compound at interface is larger than 70.1%, interfacial embrittlement will occur. 相似文献
22.
Al-Fe金属间化合物对复合板界面结合的影响(英文) 总被引:2,自引:0,他引:2
对固态铝和固态铁界面金属间化合物的生长及金属间化合物对界面结合的影响进行了研究。结果表明,固态铝和固态铁热处理后的界面主要包括Fe2Al5和FeAl3化合物层,金属间化合物恶化了界面结合强度。在拉剪测试中,断裂主要发生在Fe2Al5或FeAl3化合物层,断裂的位置主要取决于化合物层内部的缺陷,包括微裂纹和空洞。热膨胀系数不匹配产生的应力导致内部微裂纹产生,内部孔洞产生的原因是Kirkendall效应。该研究对铝和铁的焊接与连接,尤其是对铝钢复合板的制备,奠定了一定的基础。 相似文献
23.
Pyungwoo Jang Seungchan Shin Chip-Sup Jung Kwang-Ho Kim Kyu Seomoon 《Nanoscale research letters》2013,8(1):152
The possibility of a new technique for fabricating nanoparticles from thin films using selective oxidation in an atmosphere mixture of water vapor and hydrogen was investigated. Fe-5wt.%Al films were RF-sputtered and annealed in the atmosphere mixture at 900°C for up to 200 min, in order to oxidize aluminum selectively. Thermodynamics simulation showed that temperatures exceeding 800°C are necessary to prevent iron from being oxidized, as confirmed by the depth profile of XPS. As the annealing time increased, the morphology of the 200-nm Fe-Al films changed from the continuous to the discontinuous type; thus, particulate Fe-Al films formed after 100 min. The particulate 10- to 100-nm Fe-Al films showed super-paramagnetic behavior after the oxidation. Thus, a new technique for fabricating nanoparticles was successfully introduced using selective oxidation. 相似文献
24.
硅对45钢热浸镀铝层真空扩散处理显微组织的影响 总被引:1,自引:0,他引:1
利用扫描电镜和能谱分析手段研究了铝池中的硅对热浸镀铝层在真空高温扩散处理过程中的显微组织演变的影响。确定了扩散层的组成相,研究了镀层的生长动力学,讨论了扩散层空洞带的形成机理。研究表明,铝池中的硅能减少热浸镀铝层的厚度。在同样的扩散条件下硅的添加抑制了Fe2Al5的生长,促进了FeAl和富铝α-Fe层的生长。扩散处理时从含硅的Fe2Al5中容易析出τ1-(Al,Si)5Fe3相或FeAl相。硅的加入使得FeAl层和富铝α-Fe层间的空洞或晶间裂纹易于早期出现,但随着扩散时间的延长,又逐渐减小或消失。空洞的形成与消失与硅在FeAl层中的富聚有关。由于Fe2Al5相与其中析出的τ1-(Al,Si)5Fe3相发生包共晶反应,即:τ1+Fe2Al5L+FeAl,形成了不连续的外侧FeAl层。 相似文献
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27.
《Ceramics International》2017,43(10):7674-7681
In the current study, the wettability between Fe-Al alloy and sintered MgO substrate was investigated. The stable contact angle between the sintered MgO substrate and the liquid iron was approximately 134° at 1550 °C, hardly influenced by Al concentrations of 18 ppm and 370 ppm in the liquid iron. By changing hydrogen partial pressure from 0 vol% to 1 vol%, the oxygen partial pressure decreased. Meanwhile, the contact angle between the MgO substrate and the liquid iron with 370 ppm Al increased with the decrease of oxygen partial pressure. The oxygen partial pressure and contact angle were scarcely affected by increasing hydrogen partial pressure from 1 vol% to 5 vol%. In all cases with 370 ppm Al in the liquid iron, oxide layers were detected on the surface of iron samples. The oxidation of iron could be effectively prevented by increasing the hydrogen partial pressure. The MgO substrate was reduced to Mg vapor in the reducing atmosphere at a high temperature. Then the Mg vapor was dissolved into the iron even before iron melting. Under thermodynamic equilibrium condition, an oxide layer containing two components, i.e. MgO·Al2O3 phase and CaO-SiO2-MgO-Al2O3 phase, was generated on the surface of the iron sample. Due to the different wettability between the iron and the two phases, MgO·Al2O3 phase was repelled, while the CaO-SiO2-MgO-Al2O3 phase adhered to the inside area. 相似文献
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29.
铝合金表面激光熔覆Fe-Al青铜合金层的组织结构 总被引:5,自引:0,他引:5
稀有金属材料与工程 《稀有金属材料与工程》1999,28(4):1-221
研究了铝合金表面激光熔覆Fe-Al青铜层的组织结构,结果表明,熔覆层的组织结构为孪晶结构的α-Cu+颗粒状(Cu,
Fe, Si) 相似文献
30.
In this study,the two kinds of Fe–Al coatings were fabricated by pack aluminizing on low-carbon steel at different temperatures.The corrosion behavior of the Fe–Al coatings in artificial seawater was investigated by the electrochemical and weight loss techniques.Results show that the thickness of coating layer increases with increasing aluminizing temperature.The coatings exhibit high micro-hardness and good metallurgical bonding with the substrate.In comparison with the steel substrate,the corrosion current density Icorrof the Fe–Al coatings is always lower than that of substrate,about 1/38 or 1/33 after 2 h immersion,and 1/3 or 1/6 for 720 h immersion.As can be seen from the weight loss curve,the Fe–Al coatings show less loss than that of the substrate within 30-day immersion.The corrosion products formed on the surface of the coatings include oxides of Al,Mg,Fe and Ca,and pitting defect has also been found.The Fe–Al coating with higher content of Fe_2Al_5 has better corrosion resistance. 相似文献