Microstructure and properties of 90W-6Ni-4Mn alloy with low W-W contiguity by metal injection molding
As a new generation of kinetic energy armor-piercing projectile materials,the preparation of 90W-Ni-Mn alloy has the problems of high W-W contiguity,low sintering density and high processing cost.In order to solve these problems,the tungsten powder is treated with electroless nickel plating,and take shape using the feed-stock by injection molding process,and then cooperate with the self-developed new argon-argon hydrogen two-step sintering process to prepare a 90W-6Ni-4Mn alloy with low W-W contiguity.Experiments show that 90W-6Ni-4Mn alloy can be nearly net shaped,and the new sintering process can not only reduce W and Ni oxides content,but also avoid the generation of MnO.The relative density of the prepared sample reaches as high as 99.2％,the bonding phase distribution is uniform,and the W-W contiguity is low.Through microstructure and fracture mor-phology analysis,it is found that electroless nickel plating can promote the activation and sintering of tungsten skel-eton,improving the density of alloy and promoting the uniform distribution of bonded phases.The 90W-6Ni-4Mn alloy as made with low W-W contiguity slows down the failure rate due to the reduction of the weak interface of W-W,resulting in the compressive strength and tensile strength are as high as 1 583.4 MPa and 968 MPa,and the well plasticity and toughness of 21.5％and 5.3 J/cm2,respectively.
NETL
NSTL
万方数据
