机械合金化Al—Mg—Si—Cu元素粉末的特性

Al,Mg,Si和Cu元素粉末按6061铝合金成分配比进行了机械合金化（MA），对其物相、合金化特性、晶格常数、晶粒尺寸及点阵应变作了测定和分析讨论。MA初期晶粒尺寸可以达到纳米级，最小晶粒尺寸20nm；粉末点阵应变最终达0．2％；Al晶格常数变化的总趋势是不断减小；塑性较好的元素粉末可在“面上”作短程扩散，合金化易于进行，可实现完全合金化；硬度较高的脆性元素粉末可在“面上”作短程扩散，合金化易于进行，可实现完全合金化；硬度较高的脆性元素粉末只在“点上”作短程扩散，合金化不易进行，难以实现完全合金化。

Characteristics of Al, Mg, Si and Cu element powders by mechanical alloying

According to the composition of 6061 aluminum alloy, the Al, Mg, Si and Cu element powders were mechanical alloyed. Physics phases, alloying character, lattice constant, grain size and lattice strain of these powders were determined and discussed. At an initial stage of mechanical alloying, grain size can reach up to nanometer level, the finest grain size reach up to 20?nm. Generally, lattice constant is decreased, lattice strain is about 0.20% finally. Ductile element powder can diffuse through a shorter path on the plane, thus, alloying of these element powders is carried out easily and can been realized fully. Otherwise, brittle element powder can only diffuse through a shorter path on the point, its alloying is more difficulty and can been realized partly.