放电等离子烧结温度对钨合金的组织及动态力学性能的影响

Effects of Spark Plasma Sintering Temperature on Microstructure and Dynamic Mechanical Properties of 93W-4.9Ni-2.1Fe Alloy

摘要:

以纳米93W-4.9Ni-2.1Fe 合金粉末为原料，研究放电等离子烧结温度对钨合金组织和动态力学性能的影响。结果表明，采用放电等离子烧结方法可制备出组织均匀的细晶钨合金。当烧结温度在950~1400 ℃时，随着烧结温度的增加，钨颗粒平均尺寸由2 μm增大到10 μm，试样动态抗压强度随之降低；动态压缩过程中，烧结温度在1000~1200 ℃的试样塑性均较好，而当烧结温度超过1300 ℃时，试样的塑性很低，表现为明显的脆性状态

Abstract:

The effects of the spark plasma sintering temperature on microstructure and dynamic mechanical properties of the tungsten heavy alloy with nano-crystalline 93W-4.9Ni-2.1Fe alloy powder as raw material were investigated. Results show that ultra-fine tungsten alloy with uniform microstructure can be prepared by the spark plasma sintering technology. In the sintering temperature range between 950 oC and 1400 oC, the average particle size of the tungsten heavy alloy increases from 2 μm to 10 μm with the sintering temperature elevation while the dynamic compressive strength decreases accordingly. During the process of dynamic compression the plasticity of samples sintered at the temperature between 1000 oC and 1200 oC is good. However, dynamic plasticity of samples sintered at the temperature between 1300 oC and 1400 oC is almost zero, showing typical brittle failure