Effects of Doping Elements on Oxidation Properties of Low-Activation Vanadium Alloys
Effects of Doping Elements on Oxidation Properties of Low-Activation Vanadium Alloys
复制标题
掺杂元素对低活化钒合金氧化性能的影响
DOI：
10.2320/matertrans.42.1048
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发表时间：
2001
影响因子：
1.2
通讯作者：
T. Shishido
中科院分区：
文献类型：
--
作者：
M. Fujiwara;K. Natesan;M. Satou;A. Hasegawa;K. Abe;Toshitsugu Takahashi;T. Sugawara;T. Shishido
对掺杂Si、Al、Y的V-(4-5)Ti-(4-5)Cr型合金进行了研究，以开发抗氧化钒合金。为了明确掺杂元素的影响，对V-4Ti-4Cr、V-4Ti-4Cr-0.5Si、V-4Ti-4Cr-0.5Al和V-4T-4Cr-0.5Y合金的氧化行为进行了研究。对每种合金在 400、500、620 和 650°C 的空气中以及在 500°C 的空气、氦气和低氧分压气氛中暴露 250 小时进行了热重分析 (TGA) 实验。暴露后，进行质量增加测量和拉伸试验，以研究暴露气氛对每种合金的影响。在氧分压 P O2 = 20 Pa 的氦气气氛中暴露后，其质量增益比在 P O3 = 1.3 x 10 -4 Pa 的低氧分压气氛中的质量增加要小。室温拉伸试验表明，V-4Ti-4Cr-0.5Si 合金在所有气氛中暴露后具有最高的极限拉应力，而 V-4Ti-4Cr-0.5Y 的总伸长率最高。空气中的 TGA 实验结果表明，钇掺杂在较高温度暴露下更有效。 V-4Ti-4Cr-0.5Y合金在所有合金中在620℃时具有最高的抗氧化性能。 TGA数据符合抛物线氧化规律，特别是第一阶段氧化时间长达30 h。
V-(4-5)Ti-(4-5)Cr type alloys doped with Si, Al and Y were studied in an effort to develop oxidation-proof vanadium alloys. In order to clarify the effects of the doping elements, the oxidation behavior of V-4Ti-4Cr, V-4Ti-4Cr-0.5Si, V-4Ti-4Cr-0.5Al and V-4T-4Cr-0.5Y alloys was studied. Thermogravimetric analysis (TGA) experiments in air at 400, 500, 620 and 650°C and exposure to air, helium and low oxygen partial pressure atmospheres at 500°C for 250 h were carried out for each alloy. After exposure, measurement of mass gain and tensile tests were performed to study the influence of the exposure atmosphere on each alloy. After exposure to helium atmosphere with oxygen partial pressure P O2 = 20 Pa gave a smaller mass gain than that by the low oxygen partial pressure atmosphere of P O3 = 1.3 x 10 -4 Pa. Tensile testing at room temperature showed that the V-4Ti-4Cr-0.5Si alloy has the highest ultimate tensile stress, and V-4Ti-4Cr-0.5Y has the highest total elongation after exposure for all the atmospheres. The results of the TGA experiments in air show that yttrium doping is more effective at higher-temperature exposure. The V-4Ti-4Cr-0.5Y alloy has the highest oxidation-resistance at 620°C in all the alloys. The TGA data fit the parabolic oxidation law, especially in the first stage of oxidation time up to 30 h.