球磨时间对激光点火自蔓延反应合成Ni-Al合金性能影响

Effect of Milling Time on Microstructure and Mechanical Properties of Ni-Al Alloys Prepared by Self-propagating Reaction Synthesis

采用机械合金化和激光点火自蔓延烧结技术制备了Ni-25Al合金。对球磨时间分别为5、10、15、20h烧结合金进行了密度测试、微观组织、XRD以及硬度、耐磨性等力学性能测试。结果表明:合金密度随球磨时间的延长而增大,20h时密度为6.03g/mm3;烧结合金物相由γ-Ni、Ni3Al和Al2O3相构成;球磨20h时,烧结合金的硬度最高为838.42 HK,单位面积磨损量最低为2.07×10-4g/mm2。

Ni-Al alloy with the composition of Ni-25A was prepared by mechanical alloying and laser-induced self-propagating reaction synthesis.The effects of milling time on the density,microstructure,XRD and mechanical properties of Ni-25Al were studied.The results show that the density is 6.03 g/mm3 after ball milling for 20 h.Ni3Al is the main phase,with few phases such as γ-Ni and Al2O3 appearing in the SHS bulk samples.The maximum hardness of SHS bulk samples is 838.42 HK after ball milling for 20 h.The lowest wear capacity is 2.07 × 10-4 g/mm2.