The elastic strains in the particles inherited by the crystals of martensite, in Cu-AI-Mn alloys

Alloys Cu-Al-Mn containing wt. 12 % Al and wt. 6-10 % Mn were investigated. The specimens were quenched from 1173 K in water and aged at 423-773 K. In all alloys during the quenching the particles of phase CU2. 2Mno. sAI were generated. T hese p articles were i nherited by martensite. The presence of coherence particles of CU2, 2Mno. gAI phase, which are non transformed during cooling, lead to the deformation of crystalline lattice of martensite and particles. The AG (chemical driving force of austenite-martensite transformation) and martensitic stresses were evaluated approximate. The short-lived aging caused the increasing of the quantity of the phase CU2. 2Ml1o. sAI and the temperature Ms. The average martensitic stress, strength of alloys and the driving force AG were not changed in this case. Thus the short-lived aging did not change the conditions of the thermoelastic martensite forming. The alloys of Cu-Al system are not stable to the decomposition. The same kind of effect is also observed in the Cu-Al-Mn alloys. But the correlation between the martensitic transformation and the process of aging in the indicated alloys is insufficiently investigated [1]. The disintegration of metastable ß-phase of Cu-based alloys frequently begins during quenching