CAJ | 학술논문

在应变速率为0.01～50s-1时、温度为300～450℃条件下,在热压机上对AZ91镁合金的高温热压缩变形特性进行了研究,并通过金相显微镜观察合金热变形过程中的组织变化情况.研究发现,应力、应变曲线随温度的升高而降低,随应变速率的升高而升高.为了消除热电偶测温的滞后性对试样温升的影响,对实测流变应力值进行了修正.在相同应变速率、相同应变下,修正的应力要高于未修正的应力.
재응변속솔위0.01～50s-1시、온도위300～450℃조건하,재열압궤상대AZ91미합금적고온열압축변형특성진행료연구,병통과금상현미경관찰합금열변형과정중적조직변화정황.연구발현,응력、응변곡선수온도적승고이강저,수응변속솔적승고이승고.위료소제열전우측온적체후성대시양온승적영향,대실측류변응력치진행료수정.재상동응변속솔、상동응변하,수정적응력요고우미수정적응력.
The hot compression tests of AZ91 magnesium alloy were performed on warmpress at strain rates 0.01～50s-1 and deformation temperatures 300～450℃,and the microstructures of AZ91 magnesium during compression were observed by microscope.The results show that with the increase of temperatures and the decrease of strain rates.the stress-strain curves decrease.In order to eliminate the influence of temperature rise induced by hysteresis of thermocouple thermometer,the actual measured flow strees are corrected.The corrected flow stress is generally higher than the uncorrected at the same swain rates and strain.