This work presents the magnetocaloric effect (MCE) and critical behaviors of bulk alloys ( and 0.15) prepared by an arc-melting method. Under an external field of 50 kOe, we have observed the coexistence of the inverse MCE with a maximum magnetic entropy change of 1.39 at 218 K (associated with the martensitic-austenitic transition), and normal MCE with a minimum magnetic entropy change of at 308 K (associated with the ferromagnetic-paramagnetic transition in the austenitic phase) in . Meanwhile, the magnetic entropy changes for keeps normal negative, with at 315 K. Interestingly, the ferromagnetic-paramagnetic transition in the austenitic phases for both alloys is found to be second-order type. Having used the Arrott-Noakes method, the critical exponents obtained for are and , and for are and , which are close to those expected for the mean-field model ( and ). This reveals that a long-range-order ferromagnetic interaction dominates in the austenitic phase. A small deviation from the theoretical values, particularly for , is assigned to magnetic inhomogeneity induced by the martensitic-austenitic transition.