CAJ | 학술논문

采用高温等温压缩变形方法，在温度为373～673K范围和应变速率为0.001～1.0s-1范围内，测定了新型Al-10Sn-4Si合金的流变应力曲线.结果表明，该合金为正应变速率敏感材料并且具有稳态流变特征；稳态流变应力随变形速率的增加而增大，随变形温度的升高而降低.通过回归分析，建立了该合金高温塑性变形时稳态流变应力的半经验方程.这种稳态流变特征与动态回复、动态再结晶及局部晶界粘滞性流动行为有关，受热激活过程控制.
채용고온등온압축변형방법，재온도위373～673K범위화응변속솔위0.001～1.0s-1범위내，측정료신형Al-10Sn-4Si합금적류변응력곡선.결과표명，해합금위정응변속솔민감재료병차구유은태류변특정；은태류변응력수변형속솔적증가이증대，수변형온도적승고이강저.통과회귀분석，건립료해합금고온소성변형시은태류변응력적반경험방정.저충은태류변특정여동태회복、동태재결정급국부정계점체성류동행위유관，수열격활과정공제.
The true stress-strain curves of plastic deformation for newAl-10Sn-4Si alloy were tested by isothermal compression loading at high temperatures with Gleeble 1500 machine. The flow stress in the compression process for the alloy was investigated in the temperature range of 373～673K and the strain rate range of 1.0～0. 001s-1 The results show that the plastic deformation process of the alloy have steady flow characteristics and the flow stress is sensitive to strain rate. In the steady state flow,the steady stress increased with the increasing of strain rate and the decreasing of temperature. The steady flow stress equations were established by regression analysis. It was found that the flow stress characteristics was closely related to dynamic recovery, re-crystallization and sticky flow of local grain boundary, and the plastic flow was a thermally activated process governed by rate-controlling mechanism of dislocation.