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先进金属材料的研究,除金属和合金的传统研究外,还含有金属间化合物(合金带有一层有序原子结构)和金属基与金属间基复合物的研究。在它们中间,金属间化合物具有最好的高温性能,而通常应用的高温合金受温度或重量限制。Lewis对铝化铁(FeAl)和铝化镍(NiAl)进行了详细研究,发现近等原子βNiAl具有2980~0F熔点(而常用的高温合金只有2350~0F)、重量轻、抗氧化和合金处理后有强化潜能等优点。它的缺点是室温下延展性差、高温下强度较低。但添加钽后,可以增强NiAl的高温蠕变强度,接近通常高温合金2000~0F时的强度。透
Advanced metal materials research, in addition to the traditional study of metals and alloys, but also contains intermetallic compounds (alloys with a layer of ordered atomic structure) and metal-based and intermetallic complexes. Among them, intermetallics have the best high-temperature properties, whereas commonly used superalloys are temperature or weight limited. Lewis conducted a detailed study of FeAl and NiAl, and found that near-equiatomic βNiAl has a melting point of 2980 ° F to 0 ° C (compared with 2350 ° F for commonly used superalloys), light weight, anti-oxidation and alloy processing After strengthening the potential advantages. Its disadvantage is poor ductility at room temperature, lower strength at high temperatures. However, the addition of tantalum can enhance the high temperature creep strength of NiAl, which is close to the strength of conventional superalloy 2000 ~ 0F. through