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首页> 外文期刊>Journal of Materials Engineering and Performance >Continuous and Discontinuous αTi Layers Between Grains of β(Ti,Co) Phase
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Continuous and Discontinuous αTi Layers Between Grains of β(Ti,Co) Phase

机译：β（Ti，Co）相晶粒之间的连续和不连续αTi层

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The microstructure of Ti-Co polycrystals with 1.6 and 3.2 at.% Co has been studied between 690 and 810℃ after long anneals (720-860 h) in the αTi+β(Ti,Co) two-phase area of the Ti-Co phase diagram. It has been observed that depending on the annealing temperature and GB energy, the αTi phase forms either chains of separated lens-like precipitates or continuous uniform layers along β(Ti,Co)/β(Ti,Co) GBs. In other words, β(Ti,Co)/β(Ti,Co)GBs completely or partially wetted by the αTi phase were observed. At 690℃, slightly above eutectoid temperature T_(et) = 685℃, the portion of the completely wetted β(Ti,Co)/β(Ti,Co) GBs is 25% for the Ti-1.6 at.% Co alloy and 60% for the Ti-3.2 at.% Co alloy. It increases with increasing temperature and reaches the maximum of 80% for the Ti-1.6 at.% Co alloy at 780℃ and of 75% for the Ti-3.2 at.% Co alloy at 750℃. At 810℃, i.e., close to the upper border of the αTi + β(Ti,Co) two-phase area of the Ti-Co phase diagram, the portion of the completely wetted β(Ti,Co)/β(Ti,Co) GBs drops down to 40% for the Ti-1.6 at.% Co alloy and 20% for the Ti-3.2 at.% Co alloy. Thus, it has been observed for the first time, that the portion of grain boundaries completely wetted by the layers of a second solid phase can non-monotonously depend on the temperature.
机译：在Ti-α-β+（Ti，Co）两相区经过长时间退火（720-860h）后，研究了Co含量为1.6和3.2at。％的Ti-Co多晶体的微观结构，温度为690-810℃。共相图。已经观察到，取决于退火温度和GB能量，αTi相沿着β（Ti，Co）/β（Ti，Co）GBs形成分离的透镜状沉淀物的链或连续的均匀层。换句话说，观察到被αTi相完全或部分润湿的β（Ti，Co）/β（Ti，Co）GB。在690℃（略高于共析温度T_（et）= 685℃）下，Ti-1.6 at。％Co合金的完全润湿的β（Ti，Co）/β（Ti，Co）GBs的部分为25％， Ti-3.2 at。％Co合金为60％。它随温度升高而增加，在780℃时，Ti-1.6 at。％Co合金的最大值为80％，在750℃时，Ti-3.2 at。％Co合金的最大值为75％。在810℃，即靠近Ti-Co相图的αTi+β（Ti，Co）两相区的上边界，完全润湿的β（Ti，Co）/β（Ti，对于Ti-1.6 at。％Co合金，Co）GBs下降到40％，而对于Ti-3.2 at。Co合金，Co）GBs下降到20％。因此，首次观察到，被第二固相层完全润湿的晶界部分可以非单调地取决于温度。

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