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通过扭转试验对纯Al和Al-4％(原子)Mg合金系的热变形进行了研究,应变速率为0.1～1.0/秒,温度≤537℃。在每个试验温度下,Al—Mg合金的流动应力都较纯Al的高。可以认为,这种热加工(高于249℃)强化是因其平衡的亚晶粒位错林密度较高的原因。为了说明这种关系,须用特殊的淬火方法。正常淬火方法之所以不能说明这种关系,是因高温淬火不能显示组织的各种微小变化。近年来,对热变形(T/Tm>0.5)的强化机理和组织变化的研究产生了极大的兴趣。
Thermal deformation of pure Al and Al-4% (atomic) Mg alloys was investigated by torsion test at a strain rate of 0.1-1.0 / sec and a temperature of ≤537 ° C. The flow stress of Al-Mg alloy is higher than pure Al at each test temperature. It is believed that this thermal processing (above 249 ° C) is due to the higher density of subgrains dislocations that it balances. To illustrate this relationship, a special quenching method is required. The reason why the normal quenching method can not explain this relationship is that quenching can not show the microstructure of a variety of small changes. In recent years, there has been a great deal of interest in the study of the mechanism of heat deformation (T / Tm> 0.5) and the study of the microstructure changes.