DUCTILE ORDERED INTERMETALLIC ALLOYS
DUCTILE ORDERED INTERMETALLIC ALLOYS
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DOI：
10.1126/science.226.4675.636
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发表时间：
1984-01-01
期刊：
影响因子：
56.9
通讯作者：
STIEGLER, JO
中科院分区：
文献类型：
--
作者：
LIU, CT;STIEGLER, JO
许多有序的金属间化合物合金具有诱人的高温性能;然而，低延展性和脆性断裂限制了它们在结构应用中的应用。这些合金的脆化主要是由滑移系数量不足（体脆性）和晶界凝聚力差引起的。最近的研究表明，有序金属间化合物的延展性和可加工性可以通过合金化工艺和通过快速凝固和热机械处理控制微观结构特征来显著改善。这些结果表明，与有序金属间化合物相关的脆性问题可以通过使用物理冶金学原理来克服。这些原理的应用将通过Ni 3Al和Ni 3V-Co 3V-Fe 3V的结果来说明。这些合金作为一类新的高温结构材料的发展潜力进行了讨论。
Many ordered intermetallic alloys have attractive high-temperature properties; however, low ductility and brittle fracture limit their use for structural applications. The embrittlement in these alloys is mainly caused by an insufficient number of slip systems (bulk brittleness) and poor grain-boundary cohesion. Recent studies have shown that the ductility and fabricability of ordered intermetallics can be substantially improved by alloying processes and control of microstructural features through rapid solidification and thermomechanical treatments. These results demonstrate that the brittleness problem associated with ordered intermetallics can be overcome by using physical metallurgical principles. Application of these principles will be illustrated by results on Ni3Al and Ni3V-Co3V-Fe3V. The potential for developing these alloys as a new class of high-temperature structural materials is discussed.