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| 1 | 硼对AlMo0.5NbTa0.5TiZr难熔高熵合金组织和高温氧化性能的影响显示文摘目的提高AlMo0.5NbTa0.5TiZr难熔高熵合金的抗氧化性能。方法采用非自耗真空电弧熔炼法制备了AlMo0.5NbTa0.5TiZrBx(x=0、0.02、0.06)难熔高熵合金,通过系列高温氧化试验、X射线衍射分析和扫描电镜及能谱分析,研究了微量B元素的添加对该合金组织结构和高温氧化性能的影响规律。结果铸态AlMo0.5NbTa0.5TiZr合金具有典型的枝晶状凝固组织,包括由黑色枝晶间区的富Al-Ti-Zr的BCC1相、明亮枝晶区的富Mo-Nb-Ta的BCC2相以及枝晶边缘灰色过渡区的富Al-Zr相。微量B的添加没有改变AlMo0.5NbTa0.5TiZr相组成,但使合金的枝晶组织明显细化。添加B以后,AlMo0.5NbTa0.5TiZrBx合金的放热峰强度由0.95 W/g降至0.05 W/g,氧化反应的峰值温度由880℃升至1020℃;添加适量的B可改善合金短时氧化过程中的氧化皮剥落现象,并可防止合金在长时氧化过程中出现灾难性氧化。由于B的添加,AlMo0.5NbTa0.5TiZrB0.06合金表面在800℃氧化50 h过程中形成了Nb4Ta2O15和AlNbO4等具有保护性的复杂氧化物。结论添加适量的B元素不仅可抑制AlMo0.5NbTa0.5TiZr合金在800~1200℃之间的氧化反应和氧化增重程度,而且可以大幅提高合金在800℃+3 h和800℃+50 h条件下的氧化抗力。 | 要玉宏 梁霄羽 金耀华 王正品 南條弘 | 2020 | 表面技术2020，49，2： | 8 |
| 2 | 新型NbMoCrTiAl-1Si-xB(x=0、1)难熔高熵合金的微观组织及高温氧化行为研究显示文摘目的进一步改善新型低密度难熔高熵合金NbMoCrTiAl-1Si的高温氧化能力。方法采用非自耗真空电弧熔炼技术配合水冷铜模制备了NbMoCrTiAl-1Si-xB(x=0、1)合金,于1173 K下,在TGA/DSC1型热重及同步热分析仪上进行了48 h高温氧化试验,通过XRD、SEM及EDS分析了该合金的组织结构和高温氧化机制。结果铸态NbMoCrTiAl-1Si-xB(x=0、1)合金具有典型的枝晶状组织,1%B元素的添加不会改变合金枝晶的组织结构,但会使枝晶间组织形态由黑色纳米颗粒状转变为亮白色短棒状。NbMoCrTiAl-1Si合金的氧化过程由初期线性快速氧化阶段和后期抛物线慢速氧化阶段组成,氧化总增重为1.064 mg/cm^2,而NbMoCrTiAl-1Si-1B合金氧化过程则可分为具有两个不同氧化速率常数的抛物线氧化阶段,氧化总增重约为NbMoCrTiAl-1Si合金氧化总增重的1/2。经48 h高温氧化后,NbMoCrTiAl-1Si合金表面氧化膜凹凸不平,枝晶间发生了明显的内氧化现象,形成了枝晶内以片状和针状刚玉结构的Al2O3为主,枝晶间以团簇状金红石结构的TiO2为主的氧化膜,NbMoCrTiAl-1Si-1B合金表面氧化膜相对平坦,整个试样表面覆盖了一层由Al2O3、TiO2和Ti0.4Al0.3Nb0.3O2等组成的连续、致密的氧化膜。结论1%B元素的添加会促进NbMoCrTiAl-1Si-1B合金表面Al2O3和TiO2等致密氧化物的形成,抑制合金内氧化进程,显著提高合金抗高温氧化能力。 | 要玉宏 梁霄羽 金耀华 王正品 刘江南 南條弘 | 2020 | 表面技术2020，49，6： | 7 |
| 3 | 铌基合金表面Al-B包埋共渗层的组织及抗氧化性能显示文摘为提高铌基合金的抗氧化性能,采用包埋共渗法在铌基合金表面于780,860,940℃保温4 h包埋共渗Al-B涂层,采用扫描电镜、X射线衍射仪分析共渗层形貌及结构,采用能谱仪分析其成分;采用高温氧化试验研究渗层的抗高温氧化性能。结果表明:渗层主要形成了Nb Al3,Nb B2和Nb5B6三相,其中在940℃形成的渗层中形成了Al B12相,Al B12在高温下对渗层起到了一定的修复作用;经1 000℃氧化20 h后,渗层保持原始的相组成,并在表面形成由Al Nb O4,Nb O2,B2O3和Al2O3组成的致密混合氧化膜,且与基体结合良好;Al-B共渗层一定程度上改善了铌基合金的抗氧化性能。 | 秦泽华 杨阳 黄祖江 陈泉志 李伟洲 | 2015 | 材料保护2015，48，7： | 5 |
| 4 | 合金化元素对Nb-Si基超高温合金微观组织和性能的影响显示文摘Ti、B、Al和Cr等元素对Nb-Si基合金组织和性能影响的研究和报道较多,而对Zr、Mo、W和Hf等元素的研究报道较少,这些元素的加入不仅能够优化Nb-Si基合金的微观组织,也能使合金的综合性能明显提升。系统的分析和归纳这些合金元素的加入对Nb-Si基合金组织和性能的影响,对今后Nb-Si基超高温合金的设计和应用有着重大的意义。本文重点关注了Zr、Mo、W和Hf等合金元素对Nb-Si基合金组织、力学性能和高温抗氧化性能的影响。 | 尹梦姣 孙志平 李倩 沈淑馨 | 2017 | 铸造技术2017，38，8： | 2 |
| 5 | Oxidation behaviours of Nb–22Ti–15Si–2Al–2Hf–2V–(2, 14)Cr alloys with Al and Y modified silicide coatings prepared by pack cementation显示文摘Al and Y modified silicide coatings on the Nb-15Si-22Ti-(2,14)Cr-2Al-2Hf-2V alloys(where the alloy with 2 at%Cr or 14 at%Cr is hereafter referred to as 2Cr and 14 Cr alloy,respectively) was prepared by pack cementation.The microstructural evolution and the oxidation behaviours of the coating 2Cr and 14 Cr samples at 1250 ℃ were studied.The 2Cr alloy consists of Nb solid solution(Nb_(SS)) and α-Nb_5Si_3 silicide,while the Laves C15-Cr_2Nb phase arised in the 14 Cr alloy.The coating structure of the coating 2Cr sample contained the outer(Nb,X)Si_2+(Nb,X)_5Si_3 layer,the middle(Nb,X)_5Si_3 layer and the inner undeveloped intermetallic(Nb,Ti)_3(Al,X) layer,the structure of the coating 14 Cr sample consisted of the outer single(Nb,X)Si_2 layer,the middle(Nb,X)_5Si_3 layer,the transition(Nb,Ti)(Cr,Al) layer and the inner(Cr,Al)_2(Nb,Ti) layer.The coating 14 Cr sample exhibited better oxidation resistance than the coating 2Cr sample.With an outer single(Nb,X)Si_2 layer,a compact oxide scale consisting of SiO_2 and TiO_2 formed on the coating14 Cr sample,which can efficiently prevent the substrate from oxidising.For the coating 2Cr sample with an outer(Nb,X)Si_2 +(Nb,X)_5Si_3 layer,the oxide scale of the SiO_2,TiO_2,Nb_2O_5 and CrNbO_4 mixture generated,and the scale spalled out from the surface of the sample,resulting in disastrous failure. | Songming Zhang Xingrui Shi Jiangbo Sha | 2015 | Progress in Natural Science:Materials International2015，25，5： | 2 |
| 6 | Oxidation and interdiffusion behavior of a germanium-modified silicide coating on an Nb–Si-based alloy显示文摘To investigate the interdiffusion behavior of Ge-modified silicide coatings on an Nb–Si-based alloy substrate,the coating was oxidized at 1250°C for 5,10,20,50,or 100 h.The interfacial diffusion between the(Nb,X)(Si,Ge)_2(X = Ti,Cr,Hf) coating and the Nb–Si based alloy was also examined.The transitional layer is composed of(Ti,Nb)_5(Si,Ge)_4 and a small amount of(Nb,X)_5(Si,Ge)_3.With increasing oxidation time,the thickness of the transitional layer increases because of the diffusion of Si from the outer layer to the substrate,which obeys a parabolic rate law.The parabolic growth rate constant of the transitional layer under oxidation conditions is 2.018 μm×h^(-1/2).Moreover,the interdiffusion coefficients of Si in the transitional layer were determined from the interdiffusion fluxes calculated directly from experimental concentration profiles. | Jin-long Li Wan Wang Chun-gen Zhou | 2017 | International Journal of Minerals,Metallurgy and Materials2017，24，3： | 2 |
| 7 | Effect of Y_2O_3 content in the pack mixtures on microstructure and oxidation resistance of B–Y modified silicide coating显示文摘B–Y modified silicide coatings were prepared on Nb–Si based alloy by pack cementation at 1300 ℃ for 10 h. The effect of Y_2O_3 content in the pack mixtures on microstructure and oxidation resistance of the coatings was investigated. The results show that the four coatings have similar structures, which possess a(Nb,X)Si_2 outer layer and a(Nb,X)_5Si_3 transitional layer. Y_2O_3 content in the pack mixtures has an obvious effect on the Si content in the coating. The mass gains of the coatings prepared with 0.5, 1, 2 and 3 wt% Y_2O_3 in pack mixtures are 2.33, 1.96, 2.05 and 2.86 mg/cm^2 after oxidation at 1250 ℃ for 100 h, respectively. The coating prepared with 1 wt% Y_2O_3 exhibits the best oxidation resistance due to the formation of a dense glass-like borosilicate scale. | Yanxiang Liu Wan Wang Zongjie Liu Chungen Zhou | 2016 | Progress in Natural Science:Materials International2016，26，1： | 1 |
| 8 | Fe元素对Nb-16Si原位复合材料显微组织及室温力学性能的影响显示文摘采用真空非自耗电弧熔炼方法制备了Nb-16Si-xFe原位复合材料(x=2,4,6,原子分数(%),分别简称为2Fe、4Fe、6Fe合金),研究了Fe含量对Nb-16Si合金的显微组织与室温力学性能的影响。结果表明:铸态及热处理态(1350℃真空退火100h)2Fe和4Fe合金主要由Nb基固溶体(NbSS)、Nb3Si和Nb4FeSi三相组成,随着Fe含量的增多,Nb3Si含量减少,而Nb4FeSi含量增加,6Fe合金仅由NbSS和Nb4FeSi两相组成;热处理后NbSS上有细小的硅化物析出;Nb-16Si合金中加入Fe元素后所生成的新相Nb4FeSi是一个硬脆的硅化物相,其显微硬度和室温断裂韧性分别为HV 1110和1.22MPa.m1/2;随着Fe含量由2%提高到6%,热处理态Nb-16Si-xFe合金的室温断裂韧性呈略微下降趋势,而硬度和压缩强度呈上升趋势。 | 周家蕤 沙江波 | 2011 | 复合材料学报2011，28，6： | 1 |
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