Why cu based shape memory alloys(special cu-al-ni)are brittle and how can solve it?
Answer:
Cu-Al-Ni alloys fail by brittle fracture usually by intergranular “stress” cracking in a polycrystalline alloy. To make them less brittle, the total potential “stress loading” at each grain bound needs to be minimized.
This can be done by distributing the “load” over more grains by treating the alloy to form a smaller grain size. Also, improved mechanical properties could be realized by forming either a monocrystalline alloy or a polycrystalline alloy with a unidirectional structure.
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