本文测定了冷轧的及冷轧后又经不同温度退火的50％Ni-50％Fe合金的磁转矩曲线,从而对试样中的冷轧及再结晶结构作了推断。从具有完整立方结构的试样上测得的磁晶各向异性常数k_1和其他作者从单晶体上得到的值相近,而从保有冷轧结构的试样定得的k_1值则较大。考察了影响k_1测定值的可能因素;讨论了磁致伸缩各向异性导致的弹性能以及有序程度对k_1值的影响。 In this paper, the magnetic torque curves of 50% Ni-50% Fe alloy annealed at different temperatures after cold-rolled and cold-rolled were measured, and the cold rolling and recrystallization structures in the samples were deduced. The magnetocrystalline anisotropy constant k_1 measured from a sample with an intact cubic structure is similar to that obtained by other authors from a single crystal, whereas the k_1 value obtained from a specimen with a cold-rolled structure is larger. The possible factors affecting the determination of k_1 were investigated. The effect of the elastic properties due to magnetostriction anisotropy and the degree of ordering on k_1 were discussed.