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

作　　者：李刚[1] 程希文[1] 郭鹏[1] 任晶鑫[1] 

机构地区：[1]辽宁工程技术大学材料科学与工程学院,辽宁阜新123000

出　　处：《热加工工艺》2012年第16期26-28,共3页Hot Working Technology

基　　金：2012年辽宁省教育厅科技研究基金资助项目(L2012108)

摘　　要：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.

关 键 词：激光 机械合金化 NI-AL 

分 类 号：TG156.99[金属学及工艺—热处理]