The effect of γ'- and β-phase particles on the γ–α' thermoelastic martensitic transformation (MT) during heating/cooling and under stress in [001]-oriented single crystals of a Fe – 28% Ni – 17% Co – 11.5% Al – 2.5% Ti (at.%) alloy is studied in tension and compression. The influence of the ageing mode on the M_s temperature is shown. During a simultaneous precipitation of γ'- and β-phase particles following two-step ageing for 4+4 h at 873 K, a 100 K increase in the M_s temperature is observed compared to one-step ageing for 8 h. No differences (asymmetry) in the stresses σcr for the start of the stress-induced γ–α' MT nor in the values of α = dσ_cr/dT in tension and compression are observed in the crystals with γ'- and γ'+β-phase particles. The absence of asymmetry of σ_cr and α = dσ_cr/dT is due to close values of the shape memory effect (SME) and superelasticity (SE) in tension and compression. Upon precipitation of β-phase particles the values of SME and SE decrease.

Fe – 28％Ni – 17％Co – [001]取向单晶中，γ'相和β相粒子对加热/冷却过程中和应力作用下γ-α'热弹性马氏体转变（MT）的影响。研究了11.5％Al – 2.5％Ti（at。％）合金的拉伸和压缩性能。对M个时效工作方式的影响_小号温度被示出。期间γ'-和β相颗粒的以下两个步骤在873 K，在M 100 K寿命老化4 + 4 h的同时沉淀_小号温度观察到相比于一步法老化8小时。在应力没有差异（不对称）σcr为应激诱导γ-α” MT的开始，也不在α=Dσ的值_CR在具有γ′-和γ′+β相颗粒的晶体中观察到了拉伸和压缩的/ dT。不存在σ的不对称的_CR和α=Dσ _CR / DT是由于在拉伸和压缩的形状记忆效应（SME）和超弹性（SE）接近的值。当β相颗粒沉淀时，SME和SE的值降低。