高温有序金属间化合物研究的新进展

以铝化物为基的有序金属间化合物具有优异的抗高温氧化和热腐蚀的性能，作为高温下工作的结构材料是很有吸收力的。然而在许多情况下，脆性断裂和低的断裂抗力限制了它们作为有实用价值的工程材料。系统地研究了有序间化合物合金的脆性断裂行为，并弄清了脆性断裂的内在和外在的一些控制因素。第一原理计算和原子结构模拟的新近研究结果能进一步帮助了解金属间化合物的原子结合键性质、位错组态和合金元素的作用。对基本问题的更好了

Recent Advances in High Temperature Ordered Intermetallics

The ordered intermetallics based on aluminides have attractive properties in hostile environments; however, brittle fracture and poor fracture resistance limit their use as engineering materials in many cases. In recent years, considerable efforts have been devoted to the study of the fracture behavior of intermetallic alloys:as a result, both intrinsic and extrinsic factors governing brittle fracture have been identified. The recent advances in the first principles calculations and atomistic simulations further help us in understanding atomic bonding, dislocation configuration and alloying effects in intermetallics which has led to the development of nickel, iron and titanium aluminide alloys with improved mechanical and metallurgical properties for structural use. High industrial interest in ductile intermetallic alloys and several examples of industrial involvement are mentioned.