Mechanical alloying and milling of Al–Mg alloys
Mechanical alloying and milling of Al–Mg alloys
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DOI：
10.1016/j.jallcom.2008.07.161
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发表时间：
2009-08
影响因子：
6.2
通讯作者：
S. Scudino;M. Sakaliyska;K. Surreddi;J. Eckert
中科院分区：
文献类型：
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作者：
S. Scudino;M. Sakaliyska;K. Surreddi;J. Eckert
通过元素粉末混合物的机械合金化和预合金锭的机械球磨，在10-40at.%的范围内，实现了Al-Mg二元系中Mg在Al中的固溶扩展。没有观察到球磨后形成平衡相(β-Al3Mg2和γ-Al12Mg17)的迹象。固溶体的晶胞参数随着镁含量的增加而线性增加，斜率与所采用的加工路线有关。在加热过程中，由不同原料制备的Al(Mg)固溶体表现出以几个放热事件为特征的复杂行为。在低温下，随着温度的升高，从固溶体中排出的镁越来越多。在较高的温度下，形成了β‘相，这是一种成分接近Al3Mg2的六方中间相。β‘相很可能是β-Al_3Mg_2平衡相形成的先驱物，它发生在随后的放热事件中。
Solid solubility extension of Mg in Al was achieved for the binary Al–Mg system in the range of 10–40at.% Mg by mechanical alloying of elemental powder mixtures and by mechanical milling of pre-alloyed ingots. No indication for the formation of the equilibrium phases (β-Al3Mg2and γ-Al12Mg17) after milling was observed. The cell parameters of the solid solutions increase linearly with increasing Mg content with a slope that depends on the processing route used. During heating, the Al(Mg) solid solutions prepared from the different starting materials display a complex behavior characterized by several exothermic events. At low temperatures, an increasing amount of Mg is rejected from the solid solution with increasing temperature. At higher temperature, the β′-phase, a hexagonal intermediate phase with approximate composition Al3Mg2, is formed. The β′-phase most likely serves as precursor for the formation of the equilibrium β-Al3Mg2phase, which occurs in the following exothermic event.