作　　者： ; ; ; ; ; ;

机构地区： 中南大学

出　　处： 《稀有金属材料与工程》 2006年第4期550-553,共4页

摘　　要： 研究了微量Sc对Al-Cu-Li-Zr合金微观组织和拉伸性能的影响。结果表明:添加0.1%Sc(质量分数,下同)能消除铸态合金的枝晶组织,细化合金的晶粒。合金铸锭在随后的均匀化和热加工加热过程中,析出细小、弥散的次生Al3Sc质点,这种质点强烈地钉扎合金中的位错和亚晶界,从而有效地抑制合金的再结晶,具有亚结构强化和直接析出强化作用。加入微量Sc后,Al-Cu-Li-Zr合金的强度大大提高,并且合金的塑性也得到明显改善。 The effect of minor Sc additions on microstructure and tensile property of Al-Cu-Li-Zr alloy has been investigated. The results show that addition of 0.1% scandium can eliminate the dendrite of the alloy, and cause grain refinement of the alloy. Fine, dispersive and secondary Al3Sc particles precipitated from the supersaturated alpha (Al) solid solution in the heating process of ingot can effectively pin dislocation and subgrain boundary, in addition, it stabilizes substructure as well as inhibits the re-crystallization of Al-Cu-Li-Zr alloy during hot rolling and solution treatment. The addition of Sc significantly increases the strength of the alloy and gives the alloy a superior combination of strength and ductility.

关 键 词： 含 的 合金 显微组织 拉伸性能

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]