On the transformation-induced work-hardening behavior of Zr47.5Co47.5Al5 ultrafine-grained alloy

► Transformation-induced plasticity and significant work-hardening are found in ZrCoAl. ► B2 to B33 deformation-induced martensitic transformations occurs. ► B33 martensite will not form spontaneously above room temperature in ZrCoAl alloy. ► The martensitic transformations are induced by local stress concentration.