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采用相场方法模拟了Ti-Al-Nb合金α2→O相转变,探讨了有无外力场作用下弹性应变能对O相颗粒形貌、取向、数目、体积分数及平均尺寸的影响.结果表明:在弹性应变能作用下,颗粒形貌为长方块状,且沿弹性软方向分布;无外力场时,弹性应变能越大,沉淀相越易形核,稳定时颗粒数目越多,体积分数及平均尺寸越小;在外力场作用下,取向有利的变体优先长大,取向不利的变体长大受到抑制;在较小压应力作用下,沉淀相易于形核,稳定时颗粒数目增多,体积分数减小;在拉应力或较大压应力作用下,应力越大,越难于形核,稳定时颗粒数目越少,体积分数越大.
Phase transition was used to simulate the α2 → O transformation of Ti-Al-Nb alloy and the effect of elastic strain energy on morphology, orientation, number, volume fraction and average size of O phase particles was investigated with and without external force field. : Under the action of elastic strain energy, the particle morphology is rectangular and distributed along the elastic soft direction; without external force field, the greater the elastic strain energy, the more nucleus the precipitate phase becomes, Under the action of external force field, the favored variant grows preferentially and the unfavorable orientation growth is inhibited. Under the condition of small compressive stress, the precipitate phase is easy to nucleate and the number of particles in stable state Increase, the volume fraction decreases; in the tensile stress or greater compressive stress, the greater the stress, the more difficult to nucleate, the smaller the number of particles in the stable, the greater the volume fraction.