1-xMMx]30.3(Fe,Co)balM0.73B0.98 （x=0.3，0.5和0.7，質(zhì)量分?jǐn)?shù)）的磁體，對(duì)比研究其磁性能和抗腐蝕性。研究發(fā)現(xiàn)：雙主相工藝制備的磁體相比單主相工藝制備的同成分磁體展現(xiàn)了優(yōu)越的磁性能和抗腐蝕性。當(dāng)x=0.5，雙主相磁體的磁性能為Br=1.308 T，Hcj=799.98 kA/m和(BH)max=325.6436 kJ/m3，遠(yuǎn)高于同成分的單主相磁體的性能（Br=1.297 T，Hcj=746.8868 kA/m 和(BH)max=317.8428 kJ/m3）。這種改進(jìn)源于富稀土相分布的改進(jìn)以及主相晶粒間和晶粒內(nèi)部耦合作用的增強(qiáng)。當(dāng)雙主相磁體暴露在濕熱環(huán)境下時(shí)，磁體中不僅存在富稀土相腐蝕，也存在主相晶粒的腐蝕成粉現(xiàn)象，這主要是由于富稀土相與水蒸氣和氧氣反應(yīng)時(shí)產(chǎn)生氫氣，導(dǎo)致主相晶粒被氫化，由于主相晶粒間和晶粒內(nèi)部的鑭鈰分布差異，產(chǎn)生大的應(yīng)力，導(dǎo)致其表現(xiàn)出區(qū)別于單主相磁體的腐蝕行為。;In order to reduce the RE-Fe-B material cost and to balance the utilization of rare earth sources, [(Pr, Nd)1?xMMx]30.3(Fe, Co)bal- M0.73B0.98 (x =0.3, 0.5, 0.7, wt%) magnets were prepared by double main phase (DMP) and single main phase (SMP) processes. DMP magnets are superior to SMP magnets with the same nominal composition in magnetic properties and corrosion resistance. For x=0.5, the magnetic properties of DMP magnets are Br=1.308 T, Hcj=799.980 kA/m and (BH)max=325.6436 kJ/m3, which are higher than those for SMP magnets (Br=1.297 T, Hcj=746.8868 kA/m and (BH)max=317.8428 kJ/m3) with the same nominal composition, and the impro-ved RE-rich phase distribution and REs heterogeneity distribution are the main reasons. When DMP magnets are exposed to a hygro-thermal environment, there is not only RE-rich phase corrosion, but also pulverized main phase grain due to hydrogenation behavior difference between LaCe-rich and LaCe-lean shell-core within one individual grain. As a result, it is demonstrated that DMP techni-que is an effective approach to improve the permanent magnetic properties and corrosion resistance of MM-based sintered magnets."/>