Development of extrusion・ECAP one body type severe plastic working process with high plastic deformability to magnesium alloys

ECAP一种身体类型的具有高塑性变形能力的塑料工艺已经开发出来，并已对其工作条件进行了调查，以制造具有精细微结构和优良超塑性性能的高质量材料。获得精细微结构的适宜工作条件是减少面积36：1，比例为90度，工作速率为1毫米/秒，工作温度为293 K。遵循这种适合的工作条件，一个Mg-8质量%锂合金在473 K的测试温度下显示出超塑性。A maximum fracture elongation was 1610%attained with an initial？in rate of 1.5×10^\-4> s^\-1\。这段时间与Extrusion和ECAP的分离工作的情况比较了1.6次。在最佳超塑料条件下的应变率敏感性已被测量为约0.7。重要的相位精炼和分散在一个铸造Mg-8% Li允许通过这个开发过程进行处理。ECAP一种身体类型的高塑性工艺已经通过这项研究进行了演示，以实现具有高速、低温度和低体积的超塑性工作的镁合金合金。

Extrusion ・ECAP one body type severe plastic process with high plastic deformability to magnesium alloys was developed and was investigated about its working conditions for fabricating high quality materials with fine microstructure and excellent superplastic properties. Suitable working condition obtaining fine microstructure was 36:1 of reduction of area, 90 degree of shear angle, 1mm/s of working rate and 293K of working temperature. Following this suitable working condition, a Mg-8mass%Li alloy exhibited superplasticity at a testing temperature of 473K. A maximum fracture elongation was 1610% attained with an initial strain rate of 1.5×10^<-4> s^<-1>. This elongation was 1.6 times compared with the case of separate working of extrusion and ECAP. The strain rate sensitivities under the optimum superplastic conditions were measured as about 0.7. Significant phase refinement and dispersion were achieved in a cast Mg-8%Li alloy through processing by this developing process. Extrusion ・ECAP one body type severe plastic process was demonstrated through this research for superplastic working of magnesium alloys with high speed, low temperature and cavity-less.