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利用铝基二元(Al-Mg)和三元(Al-Mg-Zr)粉末混合物通过机械合金化方法制备新型Al-Mg-Zr纳米复合材料。通过XRD和TEM/EDS分析了球磨和热处理后的粉末中相的演变。对于二元Al-Mg合金来说,Al(Mg)固溶体是主要的合金相,而非晶相几乎不可能形成。向Al-10Mg混合粉末中加入5at.%的Zr,除了生成Al(Zr,Mg)固溶体以外,还生成了一些自由的Mg。这些Mg在退火处理之后扩散到了Al3Zr金属间化合物中。最终得到的产物为由固溶体和金属间化合物组成的纳米复合材料,当Zr含量增加时,最终产物的结构稳定性和硬度将有相当大的提高。含35at.%Zr的氧化物相的存在可能是提高这种合金硬度的原因。
A novel Al-Mg-Zr nanocomposite was prepared by mechanical alloying using Al-Mg and Al-Mg-Zr powder mixtures. The evolution of phases in the powders after ball milling and heat treatment was analyzed by XRD and TEM / EDS. For binary Al-Mg alloys, the Al (Mg) solid solution is the predominant alloy phase, and the amorphous phase is almost impossible to form. Adding 5 at.% Of Zr to the Al-10 Mg mixed powder results in the formation of some free Mg in addition to the Al (Zr, Mg) solid solution. These Mg diffuses into the Al3Zr intermetallic compound after the annealing treatment. The resulting product is a nanocomposite consisting of a solid solution and an intermetallic compound. As the Zr content increases, the structural stability and hardness of the final product will be considerably increased. The presence of an oxide phase containing 35 at.% Zr may be responsible for increasing the hardness of this alloy.