利用透射电镜和X射线衍射仪等仪器研究了经大变形量冷轧后Ti-15-3合金中纳米(30 nm)组织的热稳定性.结果表明:冷轧态合金在450℃保温时纳米组织的热稳定性较好,保温1 200 min后晶粒尺寸仍保持在100～150 nm;550℃时纳米组织的热稳定性逐渐降低;650℃及以上温度加热后纳米组织在极短时间内即迅速长大;纳米级β相合金在(α+β)相区退火时,α相的析出会钉扎位错和晶界,从而阻止纳米晶粒的长大;在较低的退火温度下纳米晶粒的长大与其内部拥有大量非平衡晶界有关.
The thermal stability of nanostructure of cold-rolled Ti-15-3 alloy with high reduction was studied by means of TEM and XRD. It is shown that the nanostructure of the cold rolled alloy was very stable at 450 ℃ and the size was 100-150 nm after holding for 1 200 min. The stability became lower at 550 ℃ and the nanostructure became unstable within very short time after heating at 650 ℃ or above. When the nanoscale β alloy were annealed in the two phase region of (α+β), α phase would pin the dislocations and boundries and prevent the growth of nanostructure. The growth of nanograins at relatively low annealing temperatures was associated with the non-equilibrium grain boundaries within the nanostructure.
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