气雾化粉末在半固态轧制过程中的液相渗透现象(英文)  

Liquid Penetration Phenomenon of Gas Atomized Powders during Semi-solid Rolling

作　　者：李凤仙[1] 李韶雨 李上[1] 鲍瑞[1] 易健宏[1] 

机构地区：[1]昆明理工大学,云南昆明650093

出　　处：《稀有金属材料与工程》2014年第11期2588-2592,共5页Rare Metal Materials and Engineering

基　　金：Project Implementation Supported by National Natural Science Foundation of China(50774035,51274107)

摘　　要：在氢气保护性气氛下,采用半固态轧制工艺将Al-5.8Zn-1.63Mg-2.22Cu-0.12Zr（wt%）粉末制备出生带材。研究了加热相同温度610℃（i.e.液相分数f s≈53%）时,不同的加热时间对生带材显微组织的影响,重点研究了液相渗透现象。结果表明：液相渗透程度越高,颗粒在接触界面的边界加速消失,颗粒边界发生了较大的变化。当在610℃下加热,保温时间由10 min延长至30 min时,η（Mg Zn2）相的数量减少,且在晶界处析出了更多的Al2Cu颗粒。Al-5.8Zn-1.63Mg-2.22Cu-0.12Zr（wt%）粉末在610℃下半固态轧制,其最优的保温时间为20~30 min。研究结果表明通过优化半固态轧制工艺可以制备出性能优异的带材。Under an H2 atmosphere, the green strips were prepared from Al-5.8Zn-l.63Mg-2.22Cu-0.12Zr（wt%） powder by the semi-solid rolling process. The effects of different holding time at 610 ℃ （i.e. liquid phase fraction isfS 53 %） on the microstructure evolution, especially the liquid penetration phenomenon of the strips were investigated. Results show that a higher degree of liquid penetration will accelerate the disappearance of the primary particle boundaries in the plane of contact, and a more obvious change of powder primary boundaries will occur. With increasing of holding time from 10 rain to 30 min at 610 ℃, the amount oft/（MgZn2） phase decreases and more particles A12Cu precipitate at grain boundaries. The optimum holding time for A1-5.SZn-l.63Mg- 2.22Cu-0.12Zr （wt%） powder semi-solid rolled at 610 ℃ is suggested to be between 20 min to 30 min. The present experimental analysis indicates that the strips with high mechanical properties can be produced by optimizing semi-solid powder rolling process.

关 键 词：金属粉末 半固态轧制 液相渗透 铝合金粉末 

分 类 号：TG339[金属学及工艺—金属压力加工]