摘要
研究了合金元素W,Mo,Y和Hf对Ni3Al基金属间化合物MX246高温力学性能与氧化性能的影响.实验结果表明,W和Mo的加入有利于合金高温力学性能的提高,成分为Ni-8.2Al-7.8Cr-0.1C-1Ti-0.5Hf-0.05B-4Mo-2W-0.01Y（质量分数,％）的No.6合金的高温强度和持久性能远优于MX246合金,其1100℃/100h氧化速率为0.0639g/（m2·h）,远低于MX246合金的0.2683g/（m2·h）,高温抗氧化性能的提高则主要归功于Y和Hf的作用.分析讨论了这些元素对合金性能的影响机制.优异的高温综合性能使研制的新型MX246合金在高温结构材料应用领域极具潜力.
The combined effects of W, Mo, Y and Hf additions on the high-temperature mechanical properties and oxidation behavior of Ni3Al based alloys have been studied. The results show that alloy No.6 with Ni-8.2Al-7.8Cr-0.1C-1Ti-0.5Hf-0.05B-4Mo-2W-0.01Y (mass fraction, %) possesses much better high-temperature mechanical properties than MX246 alloy with Ni-8.2Al-7.8Cr-0.1C-1Ti-0.6Zr-0.05B, which is mainly attributed to the strengthen effect of W and Mo. The additions of Y and Hf to the Ni3Al alloys can improve their oxidation behavior significantly. The 1100 degreesC /100 h oxidation rate of alloy No.6 is 0.0639 g/(m(2.)h) which is much lower than 0.2683 g/(m(2.)h) of MX246. The excellent synthesize properties make Ni3Al-base alloy No.6 become an attractive potential candidate for high-temperature structure applications. The microstructures of selected samples are correlated with mechanical and oxidation properties. The influences of additions on MX246A alloy are deeply discussed.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第11期1181-1185,共5页
Acta Metallurgica Sinica
基金
国家高技术研究发展计划资助项目715-005-0010
