CAJ | 학술논문

对压铸AlMgxSi2Mn(x=5.7~7.2)合金的微观组织进行分析,测试力学性能以及疲劳性能,研究镁含量对合金组织和力学性能的影响.结果表明:随着Mg含量的提高,合金屈服强度和布氏硬度分别提高了10.4%和9%,伸长率从8.3%降低至4.5%,抗拉强度则没有明显变化.疲劳寿命随着Mg含量的提高而提高,疲劳极限从57 MPa上升至75 MPa.合金的微观组织主要由α(Al)和 Mg2Si 相组成,Fe 相则以颗粒状的 Al3Fe 和不规则形状的Al15(Fe,Mn)3Si2存在于晶界.Mn元素的加入也降低合金的粘模倾向.
대압주AlMgxSi2Mn(x=5.7~7.2)합금적미관조직진행분석,측시역학성능이급피로성능,연구미함량대합금조직화역학성능적영향.결과표명:수착Mg함량적제고,합금굴복강도화포씨경도분별제고료10.4%화9%,신장솔종8.3%강저지4.5%,항랍강도칙몰유명현변화.피로수명수착Mg함량적제고이제고,피로겁한종57 MPa상승지75 MPa.합금적미관조직주요유α(Al)화 Mg2Si 상조성,Fe 상칙이과립상적 Al3Fe 화불규칙형상적Al15(Fe,Mn)3Si2존재우정계.Mn원소적가입야강저합금적점모경향.
@@@@Microstructure observation, tensile test and fatigue tests were conducted to investigate the effect of magnesium content on microstructure and mechanical properties of die casting AlMgxSi2Mn (x=5.7?7.2) alloys. The results indicate that with magnesium content (mass fraction) increasing from 5.7% to 7.2%, the yield strength and brinell hardness increase by 10.4%and 9%, respectively. The elongation decreases from 8.3%to 4.5%and the ultimate tensile strength is stable. The fatigue life of alloys increases with enhanced magnesium contents and the fatigue limit increases from 57MPa to 75MPa. The microstructure of those alloys consists ofα(Al) matrix and Mg2Si. Meanwhile, Al3Fe and Al15(Fe,Mn)3Si2 compounds distribute around grain boundaries. The addition of Mn reduces the die sticking tendency.