CAJ | 학술논문

对Al-Zn-Mg-Cu合金在455~470℃进行均匀化处理，然后在400℃热轧变形(变形量分别为95%、90%和80%)，随后进行固溶淬火及 T77时效处理。通过室温力学性能测试、剥落腐蚀实验，结合光学显微镜、扫描电镜、透射电镜和X射线衍射分析，研究轧制变形量对Al-Zn-Mg-Cu合金组织、力学性能以及剥蚀性能的影响。结果表明：热轧变形后，粗大第二相沿轧制方向排列，该相主要是MgZn2相和Al2CuMg相；随变形量从80%增加至95%，固溶时效态合金的再结晶体积分数由5%增加至13%,亚晶尺寸由10μm减小至3μm；变形合金的抗拉强度和屈服强度分别由610 MPa和520 MPa提高到650 MPa和560 MPa，伸长率略有下降；剥落腐蚀和应力腐蚀敏感性增加。
대Al-Zn-Mg-Cu합금재455~470℃진행균균화처리，연후재400℃열알변형(변형량분별위95%、90%화80%)，수후진행고용쉬화급 T77시효처리。통과실온역학성능측시、박락부식실험，결합광학현미경、소묘전경、투사전경화X사선연사분석，연구알제변형량대Al-Zn-Mg-Cu합금조직、역학성능이급박식성능적영향。결과표명：열알변형후，조대제이상연알제방향배렬，해상주요시MgZn2상화Al2CuMg상；수변형량종80%증가지95%，고용시효태합금적재결정체적분수유5%증가지13%,아정척촌유10μm감소지3μm；변형합금적항랍강도화굴복강도분별유610 MPa화520 MPa제고도650 MPa화560 MPa，신장솔략유하강；박락부식화응력부식민감성증가。
The effect of rolling deformation on microstructure, mechanical properties and corrosion properties of Al-Zn-Mg-Cu alloys were investigated by ambient temperature tensile testing, exfoliation corrosion testing and stress corrosion testing combined with optical microscopy (OM), scanning electronic microscopy (SEM), transmission electronic microscopy (TEM) and X-Ray diffraction(XRD). The results show that the coarsened second particles are chain-like and distribute along the rolling direction after rolling deformation;the mainly second phases are MgZn2 and Al2CuMg. With increasing deformation amount, the volume fraction of recrystallization increases from about 5%to 13%, while the sub grain size decreases from about 10μm to 3μm after solution treatment. The ultimate tensile strength and yield strength increase from 610 MPa and 520 MPa to 650 MPa and 560 MPa, respectively, the elongation decreases slightly, and the exfoliation corrosion and stress corrosion susceptibility increase.