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由热模拟压缩实验数据分别建立铸态和锻态2种组织状态的TiNiNb合金的本构方程,并采用多项式构建Arrhenius双曲正弦型本构方程参数A、n、α、Q与ε的函数关系。从热变形激活能随不同影响因子的变化规律出发,探究该合金在不同组织状态下的热加工性能。结果表明:铸态TiNiNb合金的流变应力略高于锻态,这主要与金属间化合物的长程有序点阵结构有关,铸态合金的适宜加工参数范围为应变速率ε小于0.1s-1,最大应变小于0.4,锻态合金的适宜加工参数范围为应变速率ε小于0.56s-1,最大应变小于0.5。
The constitutive equations of TiNiNb alloy in as-cast and as-forged two kinds of microstructures were established respectively from the thermal simulation and compression experiment data. The polynomials were used to construct the Arnhenius hyperbolic sine constitutive equation with the function parameters A, n, α, Q and ε . Based on the variation law of activation energy of thermal deformation with different influencing factors, the thermal processing properties of the alloy under different microstructures were explored. The results show that the flow stress of the as-cast TiNiNb alloy is slightly higher than that of the as-forged one, which is mainly related to the long-range ordered lattice structure of the intermetallic compounds. The suitable processing parameters of the as-cast alloy are strain rate ε less than 0.1s-1, The maximum strain is less than 0.4. The suitable processing parameters of forged alloy are strain rate ε less than 0.56s-1 and maximum strain less than 0.5.