通过显微硬度分析、X射线衍射分析和TEM详细研究了钽及钽钨合金在冷轧变形过程中的组织和性能演变规律,结果表明：W在Ta中具有晶粒细化和强化作用,Ta、Ta-2.5%W和Ta-7.5%W合金在1400℃温度退火1 h后的再结晶晶粒的平均尺寸为45、20和15μm;在冷轧过程中,随着变形量的增加,钽和钽钨合金的显微硬度都逐步提高,当变形量达到99%时,Ta、Ta-2.5%W和Ta-7.5%W的显微硬度分别达到了243、309和359 HV;在Ta中添加W后,合金的位错密度会得到极大的提高,其中Ta-7.5%W合金的位错密度比Ta的高一个数量级;钽和钽钨合金各取向的晶粒中的位错密度不同,其中{200}、{211}、{222}和{110}取向的位错密度依次增大,这与Taylor因子计算的结果一致;TEM研究表明,{100}取向的晶粒中形成了位错胞结构,而{110}取向的晶粒中形成了形变带组织。
Evolution of properties and structure of Ta and Ta-W alloys in the process of cold rolling were investigated by microhardness analysis, optical microstructure （OM） observation and transmission electron microscopy （TEM）. The results indicate that W has effects on strengthening and grain refinement, and the average grain size of Ta, Ta-2. 5% W and Ta-7.5% W alloys is 45, 20 and 15 ~m, respectively. As increasing of cold-rolling reduction, microhardness of Ta, Ta-2. 5% W and Ta-7.5% W alloys is improved gradually, and reaches the maximun values of 243,309 and 359 HV at reduction of 99% , respectively. The dislocation density of the alloys increases markedly by the addition of W. Especially, compared with pure Ta, Ta-7.5% W alloy is one order of magnitude higher in the density of dislocations. The dislocation density is different in cold-rolled Ta and Ta-W grains with different orientations and is consistent with the relationship 1200t 〈 12111 〈 1222/ 〈 t1101, which is confirmed by the results of calculated Taylor factors. TEM analysis indicates that dislocation ceils form in {100}, while deformation bands form in {110}.
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