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Ti-644合金成份为Ti-6Al-4V-4Mo,是一种新型高阻尼性能铸态合金。铸态时组织为α相成集束与β相成网格状相混合存在。合金750～950℃固溶水淬时阻尼性能见图1。由电镜对不同固溶温度下组织观察表明:750℃固溶水淬后部分卢β→α′粗马氏体片,此时合金组织为α+α′+β_残。800℃固溶水淬后在α′马氏体片上析出了细针状α″相,见图2,α和与α′相上出现了孪晶。随着固溶温度的升高α″相析出量增加、针变粗、α与α′相上的孪晶数量也增加。到950℃时α相消失转变成稳定的β相。这时合金组织仅剩少量粗大的α″针,孪晶基本消失。
Ti-644 alloy composition of Ti-6Al-4V-4Mo, is a new high damping performance cast alloy. The as-cast microstructure of the as-cast phase and the β phase form a mixed phase. Alloy 750 ~ 950 ℃ solution when quenched water damping performance shown in Figure 1. The microstructure observation under different solution temperature by electron microscope showed that the part of Lu β → α ’rough martensite was solidified by water quenching at 750 ℃ and the microstructure of the alloy was α + α’ + β_residual. Fine needle-shaped α “phase was precipitated on the α ’martensite sheet after solid solution quenching at 800 ℃, as shown in Fig. 2, twins appeared on the α and α’ phases.With the increase of solution temperature, α” phase Precipitation increased, needle thickening, α and α ’phase on the number of twins also increased. To 950 ° C α phase disappeared into a stable β-phase. At this time the alloy structure only a small amount of coarse α "needle, twins basically disappeared.