CAJ | 학술논문

采用拉伸性能测试、晶间腐蚀、剥落腐蚀及电化学测试,结合金相和扫描电镜等分析手段,研究了变形程度对7150铝合金再结晶及性能的影响.结果表明,变形量越大,合金的再结晶程度越高.当变形量为75%时,合金的强度最高,变形量为60%时,晶间腐蚀和剥落腐蚀敏感性最低;再结晶程度随变形量增大是导致合金抗晶间腐蚀性能降低的主要原因.当合金变形程度为75%时,综合性能最佳.
채용랍신성능측시、정간부식、박락부식급전화학측시,결합금상화소묘전경등분석수단,연구료변형정도대7150려합금재결정급성능적영향.결과표명,변형량월대,합금적재결정정도월고.당변형량위75%시,합금적강도최고,변형량위60%시,정간부식화박락부식민감성최저;재결정정도수변형량증대시도치합금항정간부식성능강저적주요원인.당합금변형정도위75%시,종합성능최가.
Effects of deformation rate on recrystallization and properties of 7150 aluminum alloy were investigated by tensile testing, intergranular corrosion, exfoliation corrosion, electrochemical testing and optical microscope(OM) and SEM (scanning electron microscope). The results indicate that the volume of recrystallization is increased with increasing in deformation rate. The highest mechanical properties can be observed with 75% deformation rate, and the lowest intergranular corrosion and exfoliation corrosion sensitivity are measured with 60% deformation rate, which is verified by electrochemical testing. The volume of recrystallization which increases with deformation rate increases is mainly responsible for weakening the resistance of local corrosion. Taking mechanical and local corrosion properties into account, the optimized deformation rate is 75%.