High-temperature metamagnetic martensitic transformation in fairly Mn-rich Ni50−xCoxMn37Ga13 (0 ≤ x ≤ 50) alloys

(a) Phase diagram is established for Ni50−xCoxMn37Ga13 (0 ≤ x ≤ 50) alloys; (b) A metamagnetic martensitic transformation occurring at high temperatures around 500 K is found in Ni30Co20Mn37Ga13 alloy, as confirmed by σ-T curves.322