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测试了TG6钛合金盘锻件STA状态+再经600℃,100h试样热暴露在不同温度下的拉伸性能。TG6钛合金随着温度升高,抗拉强度下降,塑性提高。在室温下,与STA状态试样相比,经热暴露后的试样拉伸塑性显著降低,而当测试温度在150℃以上时,试样热暴露后的拉伸塑性显著提高,亦即热稳定性得到很大程度的恢复。引起TG6钛合金热稳定性下降的主要因素是有序α2相的共格析出和表面氧化。在150℃以上的高温条件下,热稳定性的恢复归因于位错滑移模式的变化,随着温度的升高,由位错剪切α2相的集中平面滑移逐渐向位错交滑移转变,促进位错更为均匀的滑移,从而提高塑性,表现在断口上为宏观的平面形向波浪形断裂特征的转变。
The tensile properties of TG6 titanium alloy plate forging STA state + thermal exposure at 600 ℃ and 100h were tested at different temperatures. TG6 titanium alloy as the temperature increases, the tensile strength decreased, plastic increased. At room temperature, the tensile plasticity of samples after heat exposure was significantly lower than that of STA samples, whereas when the test temperature was above 150 ° C, the tensile plasticity of the samples after heat exposure was significantly increased, ie, hot Stability has been largely restored. The main factor that causes the thermal stability of TG6 titanium alloy to decline is the coherent precipitation and surface oxidation of ordered α2 phase. At high temperature above 150 ℃, the recovery of thermal stability is attributed to the change of dislocation slip mode. With the increase of temperature, the concentrated plane slip of α2 phase of dislocation shear gradually shifts to the dislocation sliding Shift change, to promote a more uniform slip dislocation, thereby enhancing the plasticity, the performance of the fracture in the macroscopic plane to wavy fracture characteristics of the change.