EFFECT OF WHEEL VELOCITY ON TEXTURE FORMATION AND SHAPE MEMORY IN Cu-AI-Ni BASED MELT-SPUN RIBBONS

摘要

The Cu-Al-Ni-Mn and Cu-Al-Ni-Ti shape memory alloys were melt-spun from 1250 deg C applying different combination of the wheel velocity (from 12 m/s up to 26 m/s). The texture consists mainly of the <100> fibre component and two sheet components orientation: (100}<001> or/and {100]<011> in the Cu-Al-Ni-Mn ribbons. In a case of the Cu-Al-Ni-Ti ribbons spun with 12m/s or 19m/s only <100> fibre component and sheet texture (100)<011> were observed. However, increase of the wheel velocity up to 26m/s causes formation of the <111> and (111}<112> textural components. The grains orientation significantly influenced the shape recovery measured as a change of elongation under constant load during thermal cycling. The maximum of recoverable strain under constant tensile load was 5,8 percent and 6,2 percent for Cu-Al-Ni-Mn and Cu-Al-Ni-Ti alloy, respectively.