CAJ | 학술논문

对比研究脉冲电流轧制工艺与温轧工艺对AZ31镁合金板材的力学性能、织构、微观组织与沉淀相等方面的影响。结果表明：脉冲电流具有促进冷轧AZ31镁合金低温再结晶能力的作用。脉冲电流轧制后的镁合金板材组织由细小的等轴再结晶粒与析出相构成，没有发现孪晶组织，并且完全再结晶，原始晶粒均被细小的再结晶晶粒取代，再结晶晶粒内的位错密度低。而温轧镁合金组织则由稍拉长变形孪晶、粗大的再结晶晶粒和析出相构成，再结晶的晶粒内位错密度高。两种轧制方式下的镁合金析出相均为Mg17Al12。脉冲电流轧制后镁合金的织构具有典型基面织构的特征，而脉冲电流轧制镁合金的织构则出现横向偏转；脉冲电流轧制后镁合金的屈服强度与伸长率均比温轧镁合金的大，但抗拉强度正好相反。
대비연구맥충전류알제공예여온알공예대AZ31미합금판재적역학성능、직구、미관조직여침정상등방면적영향。결과표명：맥충전류구유촉진랭알AZ31미합금저온재결정능력적작용。맥충전류알제후적미합금판재조직유세소적등축재결정립여석출상구성，몰유발현련정조직，병차완전재결정，원시정립균피세소적재결정정립취대，재결정정립내적위착밀도저。이온알미합금조직칙유초랍장변형련정、조대적재결정정립화석출상구성，재결정적정립내위착밀도고。량충알제방식하적미합금석출상균위Mg17Al12。맥충전류알제후미합금적직구구유전형기면직구적특정，이맥충전류알제미합금적직구칙출현횡향편전；맥충전류알제후미합금적굴복강도여신장솔균비온알미합금적대，단항랍강도정호상반。
Electropulsing rolling (ER) and warm rolling (WR) processes were performed to roll AZ31 magnesium alloy sheets. Mechanical properties, microstructure and texture evolution of these specimens were investigated after rolling. The results indicate that electropulsing accelerates the recrystallization of AZ31 alloy sheets during hot rolling. After electropulsing rolling at a relatively low temperature, the microstructure of the sample shows fine equiaxed recrystallized grains with a lower density of dislocations and precipitates. In contrast, the microstructure of the sample after warm rolling shows elongated grain, numerous deformed twins, and a high density of dislocation and precipitates. Electropulsing rolling helps weaken the basal fiber texture. Although both the alloy sheets (ER and WR) have typical basal fiber texture, the maximum pole intensity of basal in ER sample is weaker. ER sheet has higher yield strength and elongation compared to WR sheet. As a promising technique, electropulsing rolling can be used to improve the microstructure and mechanical properties of materials.