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利用W颗粒表面化学镀Ni结合SPS的方法,制备了低W-W连接度65W-25Cu-10Ni合金,并开展了其准静态力学性能研究。结果表明,制得的Ni包W复合粉中,Ni包覆层分布均匀且与W结合良好;以Ni包W复合粉和Cu粉为原料制备的65W-25Cu-10Ni合金的组织均匀且致密。在准静态压缩加载条件下,与65W-35Cu合金相比,65W-25Cu-10Ni合金的强度及塑性均大幅度提高;在准静态拉伸加载条件下,与65W-35Cu合金相比,65W-25Cu-10Ni合金的强度较高,塑性没有明显提高。机理分析表明,与65W-35Cu合金相比,65W-25Cu-10Ni合金中W-W连接度较低,粘结相由Cu相转变为Cu0.81Ni0.19固溶体,且W与粘结相之间形成了冶金结合,以上3个因素共同导致65W-25Cu-10Ni合金强度的提高;此外,W-W连接度的降低以及W-粘结相界面结合强度的提高是65W-25Cu-10Ni合金在准静态压缩加载条件下塑性提高的原因。
A W-W 65W-25Cu-10Ni alloy with low W-W connectivity was prepared by electroless Ni plating combined with SPS on W particles. The quasi-static mechanical properties of the alloy were also studied. The results show that the Ni-coated W composite powders have uniform distribution of Ni coating and good bonding with W. The microstructure of 65W-25Cu-10Ni alloy with Ni-W composite powder and Cu powder as raw materials is uniform and dense. Compared with 65W-35Cu alloy, the strength and plasticity of 65W-25Cu-10Ni alloy are greatly improved under quasi-static compression loading conditions. Compared with 65W-35Cu alloy, 25Cu-10Ni alloy higher strength, no significant increase in plasticity. The mechanism analysis shows that the WW connectivity of 65W-25Cu-10Ni alloy is lower than that of 65W-35Cu alloy, the bonding phase changes from Cu phase to Cu0.81Ni0.19 solid solution, and W forms with the bonding phase Metallurgical bonding, the above three factors lead to 65W-25Cu-10Ni alloy strength; In addition, the reduction of WW connectivity and W-bonding interface bonding strength is 65W-25Cu-10Ni alloy quasi-static compression loading conditions Lower plastic reason.