Mo-Cu合金烧结和形变强化研究（英文）

Investigation on sintering and deformation strengthening of Mo-Cu alloy

用机械合金化法制取Mo-8wt%Cu纳米复合粉末,采用液相烧结和后处理工艺制备了全致密Mo-8wt%Cu合金。通过扫描电镜对Mo-Cu液相烧结和变形加工后合金显微组织进行了分析,研究了各种工艺参数对Mo-Cu合金致密性、拉伸强度和延伸率的影响。结果表明,高能球磨的Mo-8wt%Cu纳米复合粉末坯体,经液相烧结后,其烧结态为Mo和Cu的复合网状组织,在1 250℃烧结30min,可获得相对密度高达98.6%的Mo-Cu合金。再经静液挤压和旋转锻造变形加工处理后,可获得全致密的Mo-8wt%Cu合金。在室温静液挤压40%形变率的条件下,其拉伸强度可达576 MPa,延伸率为5.8%。

Mo-Swt%Cu nanocomposite powders were fabricated by mechanical alloying, and full density alloy was obtained via liquid-phase sintering and post-treatment process. The microstructure of Mo-8wt%Cu alloy was investigated by scanning elec-tron microscope （SEM） , and the effects of process parameters on relative density, tensile strength and elongation were stud-ied. The results indicate that the relative density of Mo-Cu alloy is 98. 6% after sintering at 1 250℃ for 30 min, and its micro-structure is composite network The full density of Mo-Cu alloy can be obtained when specimens are treated through deforma-tion strengthening process of rotating forging and hydrostatic extrusion The tensile strength and elongation rate are 576 MPa and 5. 8% ,respectively, when hydrostatic extrusion deformation degree is 40%.