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通过Mn的加入量的变化,探讨了Mn在W—Ni-Fe—Co(Mn)系重合金中的存在状态及其作用机制。结果表明:Mn的存在,可使W—Ni-Fe-Co系重合金的塑性和韧性得以提高;Mn在合金中,主要以球形细小颗粒状fcc的MnO和Mn3O4,四方晶系的Mn2O3,正交、四方及bcc的Mn2O3,正交晶系的MnO2及γ-MnO2,六角晶系的δ-MnO2和fcc的α-MnS之状态弥散分布于粘结相中,且部分固溶于粘结相和扩散于钨颗粒中;Mn在合金中的作用机制为,对O原子和S原子等杂质元素在钨颗粒/粘结相界面上的净化作用和对粘结相的固溶强化作用。
The existence of Mn in W-Ni-Fe-Co (Mn) series heavy alloys and its mechanism were discussed by the change of Mn addition. The results show that the presence of Mn can improve the plasticity and toughness of W-Ni-Fe-Co heavy alloys. In the alloys, MnO and Mn3O4 with fcc spherical fine particles and Mn2O3 with tetragonal Mn The states of cross-tetragonal and bcc Mn2O3, orthorhombic MnO2 and γ-MnO2, hexagonal δ-MnO2 and fcc α-MnS were dispersed in the binder phase and partially dissolved in the binder phase And diffused in the tungsten particles. The mechanism of Mn in the alloy is to purify the interface of the tungsten particles / binder phase and the solid solution strengthening effect on the binder phase of O and S atoms.