ROW: Mechanical Alloying of Nb3Al Intermetallics

本研究的目的是研究 机械合金化制备纳米晶Nb_3A_1 元素粉末 选择Nb 3A 1金属间化合物是因为其 结构铝化物中的最高温度能力， 以及其高电流密度特性， 超导体 机械合金化的吸引力 Nb 3Al金属间化合物的合成源于其 制造具有受控微观结构的合金， 处理. 这对于Nb和A1尤其重要， 在熔点和密度上有很大的差异， 导致传统的熔化技术变得困难， 危险且不易控制。 此外，机械 合金化具有获得非常细的晶粒尺寸的潜力， 最终在纳米范围内， 性能大大超过那些传统加工 金属间化合物 纳米结构的主要优点 加工-超塑性-对金属间化合物更有益 通常以缺乏延展性而闻名， 可成形性 因此，Nb 3A 1作为一种非常高的 耐高温，相对较低的密度和氧化 耐高温材料可充分用于工业和航空航天 应用. 这些合金在两个方面都非常有趣 超导和航空航天/结构应用， 如果能够改善其延展性，可以广泛使用。

The purpose of the research is to study the feasibility of nanocrystalline Nb3A1 formation by mechanically alloying elemental powders. Nb3A1 intermetallic was chosen for its highest temperature capability among structural aluminides as well as for its high current density property as a superconductor. The appeal of mechanical alloying for the synthesis of Nb3A1 intermetallics stems from its capability to make alloys with controlled microstructure via solid-state processing. This is particularly important for Nb and A1 which have large differences in melting points and densities thereby causing conventional melting techniques to be difficult, hazardous and less controllable. In addition, mechanical alloying has the potential of obtaining very fine grain sizes, eventually in the nanometer range that hold the promise for properties greatly exceeding those of conventionally processed intermetallic compounds. The main benefit of nanostructure processing -superplasticity- is more rewarding for intermetallics that are usually known for their complete lack of ductility and formability. Consequently, the benefits of Nb3A1 as a very high temperature resistant, relatively less dense and oxidation resistant material may be fully used in industrial and aerospace applications. These alloys are extremely interesting in both superconducting and in aerospace/structural applications and could be widely used if their ductility could be improved.