综述了新一代铝合金晶粒细化剂Al Ti C的理论研究情况。Al Ti C晶粒细化剂克服了Al Ti B的缺陷 ,其异质形核核心TiC比TiB2 的聚集倾向更小 ,并对Zr、Cr、V、Mn等元素“中毒”免疫。在相同添加量时 ,Al Ti C细化效果优于Al Ti B ,已成为...综述了新一代铝合金晶粒细化剂Al Ti C的理论研究情况。Al Ti C晶粒细化剂克服了Al Ti B的缺陷 ,其异质形核核心TiC比TiB2 的聚集倾向更小 ,并对Zr、Cr、V、Mn等元素“中毒”免疫。在相同添加量时 ,Al Ti C细化效果优于Al Ti B ,已成为取代Al Ti展开更多
系统论述了铝工业中常用的Al Ti、Al B、Al Ti B(Ti/B>2.22)、Al Ti B(Ti/B<2.22)、Al Ti C等5 大系列细化剂的细化机制,包括包晶理论、共晶理论、三元包晶理论、三元共晶理论、“碳化物硼化物粒子”理论、“TiC粒子团”理论、包...系统论述了铝工业中常用的Al Ti、Al B、Al Ti B(Ti/B>2.22)、Al Ti B(Ti/B<2.22)、Al Ti C等5 大系列细化剂的细化机制,包括包晶理论、共晶理论、三元包晶理论、三元共晶理论、“碳化物硼化物粒子”理论、“TiC粒子团”理论、包晶“残骸”(hulk)理论、超形核(Hypernucleation)理论、双重形核机制(“duplex”nucleation mechanism)和复杂共晶机制等,分析了各种机制的科学性和局限性。展开更多
Solidification experiments were carried out in Al-Cu （w（Cu） = 5%） alloy to investigate the influence of pulse magneto-oscillation （PMO） on the efficiency of the Al3Ti1B refining agent at high superheat. The expe...Solidification experiments were carried out in Al-Cu （w（Cu） = 5%） alloy to investigate the influence of pulse magneto-oscillation （PMO） on the efficiency of the Al3Ti1B refining agent at high superheat. The experimental solidification results show that the degree of superheat has remarkable influence on the efficiency of the grain refiner. However, the application of PMO has the potential to reduce the influence of superheat variation on the efficiency of the grain refiner. Finally, the mechanism underlying this phenomenon is discussed by performing a numerical simulation to show the forced flow inside the melt caused by PMO.展开更多
采用石墨粉加入到Al Ti合金中的方法来制备Al Ti C晶粒细化剂。采用扫描电镜和透射电镜观察了Al Ti C合金的微观形貌 ,采用X射线衍射装置检测了Al Ti C合金中的相组成。结果表明 ,在制备Al Ti C合金过程中 ,温度低于 12 73K先生成TiC粒...采用石墨粉加入到Al Ti合金中的方法来制备Al Ti C晶粒细化剂。采用扫描电镜和透射电镜观察了Al Ti C合金的微观形貌 ,采用X射线衍射装置检测了Al Ti C合金中的相组成。结果表明 ,在制备Al Ti C合金过程中 ,温度低于 12 73K先生成TiC粒子 ,随着保温时间的延长TiC转变成为Al4C3 ;但温度升高到 15 73K以上时 ,Al4C3 会分解重生成TiC。展开更多
文摘系统论述了铝工业中常用的Al Ti、Al B、Al Ti B(Ti/B>2.22)、Al Ti B(Ti/B<2.22)、Al Ti C等5 大系列细化剂的细化机制,包括包晶理论、共晶理论、三元包晶理论、三元共晶理论、“碳化物硼化物粒子”理论、“TiC粒子团”理论、包晶“残骸”(hulk)理论、超形核(Hypernucleation)理论、双重形核机制(“duplex”nucleation mechanism)和复杂共晶机制等,分析了各种机制的科学性和局限性。
基金The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China （Grant No. 51320105003）, Shanghai Government （Grant No. 14DZ2261200）, and the Science and Technology Commission of Shanghai Municipality （Granted No. 15520710800）.
文摘Solidification experiments were carried out in Al-Cu （w（Cu） = 5%） alloy to investigate the influence of pulse magneto-oscillation （PMO） on the efficiency of the Al3Ti1B refining agent at high superheat. The experimental solidification results show that the degree of superheat has remarkable influence on the efficiency of the grain refiner. However, the application of PMO has the potential to reduce the influence of superheat variation on the efficiency of the grain refiner. Finally, the mechanism underlying this phenomenon is discussed by performing a numerical simulation to show the forced flow inside the melt caused by PMO.
