CAJ | 학술논문

通过金相显微镜、扫描电镜、XRD 衍射仪以及拉伸力学性能测试研究了微量 Mn 元素对 Al-Zn-Mg-Cu超高强铝合金挤压带板及其制备的等温模锻件的平面力学性能各向异性的影响。结果表明，微量 Mn 元素的加入可以产生大量含 Mn 第二相，促进超高强铝合金锻件的再结晶，使变形织构强度减弱，再结晶织构强度增加，降低高强铝合金锻件的平面力学性能各向异性。此外，弥散细小的含锰相使合金断裂形式转变为穿晶延性断裂，提高了合金的延伸率。
통과금상현미경、소묘전경、XRD 연사의이급랍신역학성능측시연구료미량 Mn 원소대 Al-Zn-Mg-Cu초고강려합금제압대판급기제비적등온모단건적평면역학성능각향이성적영향。결과표명，미량 Mn 원소적가입가이산생대량함 Mn 제이상，촉진초고강려합금단건적재결정，사변형직구강도감약，재결정직구강도증가，강저고강려합금단건적평면역학성능각향이성。차외，미산세소적함맹상사합금단렬형식전변위천정연성단렬，제고료합금적연신솔。
The effects of the micro Mn element on the in-plane anisotropy of the extruded plate and its isother-mal forged piece,which was made of super ultra-high strength Al-Zn-Mg-Cu alloy,were investigated by optical mi-croscopy,scanning electron microscopy,X-ray diffraction and tensile tests.The results indicate that the addition of Mn leads to large amount of second phase containing Mn and promotes the recrystallization of the extruded plate.The intensity of the recrystallization texture increases with the decrease of the deformation texture.As a result,the in-plane anisotropy of the tensile mechanical properties is refined.In addition,the dispersed Mn-containing second phases make alloy transfer into transgranular ductile fracture,which improves the elongation of the alloy.