热处理对低W-W连接度W-Cu-Zn合金静、动态力学性能的影响

发布时间：2018-05-03 09:20

  本文选题：钨铜锌合金 + SPS　； 参考：《稀有金属材料与工程》2017年04期

【摘要】：采用钨粉表面化学镀铜与SPS固相烧结2种工艺相结合的方法,制备出具有低W-W连接度特征及以黄铜作为粘结相的W-Cu-Zn合金,研究了热处理工艺对合金组织与性能的影响。微观分析表明所制备出的W-Cu-Zn合金中,钨颗粒均匀分布在黄铜粘结相中,粘结相为α相Cu-Zn固溶体。热处理后钨与黄铜粘结相的两相分布没有发生变化,但力学性能变化显著,经870℃随炉冷却热处理后,W-Cu-Zn合金硬度(HV)由1438 MPa提高至1723 MPa,准静态压缩加载时抗断裂强度由650 MPa提高至750 MPa,临界失效应变由0.18增大至0.26,静态力学性能显著提高。动态压缩加载时抗断裂强度由710 MPa提高到900 MPa,临界失效应变由0.24提高到0.4,动态力学性能显著提高。机理分析表明,热处理前W-Cu-Zn合金的黄铜粘结相中存在Zn元素分布不均的现象,经870℃随炉冷却热处理后黄铜粘结相中Zn元素分布的均匀性大幅度提高,这是合金力学性能提高的原因之一;此外,热处理后黄铜粘结相中形成了大量细小弥散分布的Cu_3Zn析出相,起到弥散强化作用,这是合金的强度显著提高的另一个原因。
[Abstract]:By combining electroless copper plating on tungsten powder with SPS solid state sintering, the W-Cu-Zn alloy with low W-W bonding degree and brass as bonding phase was prepared. The effect of heat treatment on the microstructure and properties of the alloy was studied. The microanalysis shows that tungsten particles are uniformly distributed in the brass bonded phase in the prepared W-Cu-Zn alloy, and the bonding phase is a 伪 phase Cu-Zn solid solution. After heat treatment, the two-phase distribution of bonding phase between tungsten and brass did not change, but the mechanical properties changed significantly. After cooling heat treatment at 870 鈩，

本文编号：1837928