Structural and magnetic states of alloys of Ni3Mn-Ni3Ti and Nb3Mn-Ni,V
sections have been studied by neutron diffraction and magnetic suscep
tibility measurements. Kurnakov temperatures in gamma'-phase were foun
d to increase owing to alloying with titanium and vanadium. Concentrat
ion dependences of long-range order parameters have been determined an
d phase diagrams of the ordered alloys have been constructed. Long-ran
ge ferromagnetic ordering has been found in Ni3Ti intermetallic compou
nd alloyed with manganese.