CAJ | 학술논문

研究了Sr加入量分别为0．01％、0．015％、0．02％，变质保温时间分别为60min、80min、100min，对4004铝合金变质效果的影响。结果表明：Sr加入量低于0．015％、变质保温时间小于80min时，合金组织和力学性能均没有达到完全变质状态；Sr加入量0．015％、变质保温时间80min时，4004铝合金变质效果最好，合金组织中的初晶硅转变为细小的圆状或短棒状，共晶硅也由片状或针状转变为纤维状，合金的抗拉强度和伸长率达到最大值193MPa和4．2％；Sr加入量超过0．015％、变质保温时间超过80min时，随着加入量的增加，合金组织开始变得粗大，抗拉强度随着下降。
연구료Sr가입량분별위0．01％、0．015％、0．02％，변질보온시간분별위60min、80min、100min，대4004려합금변질효과적영향。결과표명：Sr가입량저우0．015％、변질보온시간소우80min시，합금조직화역학성능균몰유체도완전변질상태；Sr가입량0．015％、변질보온시간80min시，4004려합금변질효과최호，합금조직중적초정규전변위세소적원상혹단봉상，공정규야유편상혹침상전변위섬유상，합금적항랍강도화신장솔체도최대치193MPa화4．2％；Sr가입량초과0．015％、변질보온시간초과80min시，수착가입량적증가，합금조직개시변득조대，항랍강도수착하강。
The paper highIighted modification effect of increasing Sr content (0. 01,0. 015,0. 02 wt %)on 4004 aI oy with increasing modification hoIding time (60,80,100min).The resuIts indicated when Sr addition was beIow 0.015% and hoIding time was Iess than 80min,neither microstructure nor mechanicaI properties of the aI oy reached fuI y modified state;0.015%Sr addition and 80min hoIding time were best effective for the aI oy modification with uItimate tensiIe strength and eIongation of 193Mpa and 4. 2% respectiveIy,primary siIicon became gIobuIar or short rod-Iike and eutectic siIicon transformed to fibrous from fIaky or acicuIar in microstructure of the aI oy;excessive Sr addition and hoIding time resuIted in coarse grain and decIine of tensiIe strength.