高能球磨时间对纯钼微观组织与力学性能的影响

Effect of High-Energy Ball Milling Time on Microstructure and Mechanical Properties of Pure Molybdenum

采用“高能球磨+热压烧结法”制备出经过不同时间(0 h,15 h,30 h)高能球磨处理的纯钼块体材料。对比分析高能球磨时间对纯钼烧结后的微观组织与力学性能的影响规律,结果表明,与未经过高能球磨处理的纯钼相比,高能球磨15 h后的纯钼材料晶粒尺寸显著减小,其室温压缩屈服强度从365 MPa提高至622 MPa,维氏硬度从168 HV10提高至188 HV10。当球磨时间从15 h增至30 h,纯钼的晶粒尺寸增大,且晶粒尺寸分布不均匀,其室温压缩屈服强度与维氏硬度均降低。

Pure molybdenum bulk materials treated by high-energy ball milling for 0,15,30 h were prepared by high-energy ball milling and hot-pressing sintering.The effect of high-energy ball milling time on microstructure and mechanical properties of pure molybdenum was analyzed.The results show that compared with pure molybdenum without high-energy ball milling treatment,the grain size of pure molybdenum decreases significantly after high-energy ball milling for 15 h,and its compressive yield strength at room temperature increases from 365 MPa to 622 MPa,and the microhardness increases from 168 HV10 to 188 HV10.When the milling time increases from 15 h to 30 h,the grain size of pure molybdenum increases and the grain size distribution is not uniform.Besides,its compressive yield strength and microhardness at room temperature decrease.