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| Microstructure and properties of 90W-6Ni-4Mn alloy with low W-W contiguity by metal injection molding |
| WU Wei，DENG Jikun，REN Boyong，LIU Junwu，ZHONG Honghai，JIANG Yang |
| （School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China） |
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Abstract 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 feedstock
by injection molding process, and then cooperate with the self-developed new argon-argon hydrogen twostep
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 morphology
analysis, it is found that electroless nickel plating can promote the activation and sintering of tungsten skeleton,
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 WW,
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.
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Received: 03 March 2023
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Corresponding Authors:
蒋阳（1965—），男，博士，教授，博士生导师，研究方向为先进粉体材料与粉末冶金。
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2024, Vol. 34 
