论文部分内容阅读
Al_3Ti合金具有密度低(3.4g/cm~3),熔点较高(～1613K),热强性和抗高温氧化性好等特性而引人注目,有望成为新的高温结构材料.当量化学配比的Al_3Ti合金具有四方有序DO_(22)结构,用Fe,Mh,Cr,Ni等元素替代合金中一定量的Al,可将DO_(22)结构转变成对称性高的立方有序Ll_2结构,在Al_3Ti-8Mn单相合金的基础上通过第四组元Nb的进一步合金化,在其Ll_2基体上形成了富Nb的DO_(22)第二相.经熔体急冷后,Al_3Ti-Mn-Nb合金的基体仍然保持Ll_2结构.本文研究了高能球磨过程中Al_3Ti-Mn-Nb四元合金的有序-无序转变,并对球磨后退火时发生的重有序化过程进行了实验分析.
Al_3Ti alloy is attracting attention due to its low density (3.4g / cm ~ 3), high melting point (~ 1613K), thermal strength and high temperature oxidation resistance and is expected to become a new high temperature structural material. Al_3Ti alloy has a tetragonal ordered DO_ (22) structure. The substitution of Fe, Mh, Cr and Ni for a certain amount of Al can transform the DO_ (22) structure into a highly symmetrical cubic Ll_2 structure, Based on the Al_3Ti-8Mn single-phase alloy, Nb-enriched DO_ (22) second phase was formed on the Ll_2 matrix by further alloying of the fourth element Nb.After the melt quenched, Al_3Ti-Mn-Nb The matrix of the alloy still maintains the structure of Ll_2.In this paper, the order-disorder transition of Al_3Ti-Mn-Nb quaternary alloy during high-energy ball milling has been studied, and the reorganization process during ball-milling annealing has been analyzed.