SIMA法处理AZ61热、冷压形变及半固态等温组织的比较研究

研究镁合金AZ61在SIMA法处理过程中压缩形变条件下,冷或热形变方式、形变率以及相应的等温热处理参数等对组织的影响规律。在同等热处理条件下,进行冷或热形变方式两套实验方案比较研究。结果表明,SI-MA法中,镁合金AZ61预变形采用热变形或冷变形均可得到细小非枝晶组织,虽演变机理不同,但在储存能趋于饱和之前,增加镁合金试样的热形变率或冷形变率,可以使热处理后非枝晶化效果和质量提高,但必须选择适当的等温热处理温度和保温时间。

Comparative research on hot or cold predeformation strain and semi-solid isothermal microstructure of AZ61 magnesium alloy for upsetting in SIMA process

The influences of the hot or cold upsetting predeformation mode and strain ratio as well as other isothermal heat-treat parameters etc on the formation of non-dendrite microstructure of AZ61 magnesium alloy in SIMA process were researched. At coordinative heat treating condition, the impact of hot upsetting predeformation on the semi-solid microstructure was comparative- ly studied with cold upsetting predeformation, the results indicate that AZ61 magnesium alloys all obtain the non-dendrite micro- structure by hot or cold upsetting predeformation in SIMA process, although their evolutive mechanism is different, increasing hot or cold upsetting predeformation rate can enhance the effect and quality of the non-dendrite microstructure before deposited energy to saturation, but the right isothermal temperature and time should are selected.