CAJ | 학술논문

采用固相再生方法回收AZ91D镁合金边角料,研究再生合金的低温力学性能、微观组织和断口形貌.在WDW-3100型微机控制电子万能试验机上进行低温拉伸实验,实验温度为27,-70,-100和-130℃；在JB30A型冲击试验机上进行冲击实验,温度分别为27,(-70±5)和(-130±5)℃.结果表明:再生合金在固相再生过程中发生了动态再结晶,块与块之间结合较好,原始的块与块之间的界面已经不能分辨.再生合金随着温度的降低,抗拉强度略有增加,伸长率呈下降趋势,即温度降低脆性倾向增加,在-130℃时拉伸,抗拉强度和伸长率分别为360.65MPa和5.46%；随着冲击温度的降低,再生合金的冲击功随之降低,在-130℃时冲击功为3.06 J/cm2.
채용고상재생방법회수AZ91D미합금변각료,연구재생합금적저온역학성능、미관조직화단구형모.재WDW-3100형미궤공제전자만능시험궤상진행저온랍신실험,실험온도위27,-70,-100화-130℃；재JB30A형충격시험궤상진행충격실험,온도분별위27,(-70±5)화(-130±5)℃.결과표명:재생합금재고상재생과정중발생료동태재결정,괴여괴지간결합교호,원시적괴여괴지간적계면이경불능분변.재생합금수착온도적강저,항랍강도략유증가,신장솔정하강추세,즉온도강저취성경향증가,재-130℃시랍신,항랍강도화신장솔분별위360.65MPa화5.46%；수착충격온도적강저,재생합금적충격공수지강저,재-130℃시충격공위3.06 J/cm2.
Low temperature mechanical properties of AZ91D magnesium alloy fabricated by solid recycling process from recycled scraps were studied.Various microstructural analyses were performed using optical microscopy (OM) and scanning electron microscopy (SEM).The recycled specimens consist of fine grains due to dynamic recrystallization and the interfaces of original individual scraps are not identified.Tensile tests were performed at a strain rate of 5×10 3 S-1 at room temperature (27 ℃),-70,-100 and -130 ℃,respectively.Ultimate tensile strength of the specimens increases slightly with decreasing the tensile temperature,and elongation to failure decreases with decreasing the tensile temperature.The tensile specimens at -130 ℃ show the highest ultimate tensile strength of 360.65 MPa and the lowest elongation to failure of 5.46％.Impact tests were performed at room temperature (27℃),-70 and -130 ℃,respectively.Impact toughness decreases with decreasing the impact temperature.The impact specimens at -130 ℃ show the lowest impact toughness of 3.06 J/cm2.