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Investigation on sintering and deformation strengthening of Mo-Cu alloy


HU Bao-quan, WANG Yan-zhong, LIU He-ping

 

(School of Materials Science and Engineering, North University of China, Taiyuan 030051, China)

 

Abstract: Mo-8wt%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 electron microscope (SEM), and the effects of process parameters on relative density, tensile strength and elongation were studied. The results indicate that the relative density of Mo-Cu alloy is 98.6% after sintering at 1 250 ℃ for 30 min, and its microstructure is composite network. The full density of Mo-Cu alloy can be obtained when specimens are treated through deformation 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%.

 

Key words: mechanical alloying; Mo-Cu alloy; liquid-phase sintering; deformation strengthening

 

CLD number: TF125.24Document code: A

 

Article ID: 1674-8042(2017)02-0173-05  doi: 10.3969/j.issn.1674-8042-2017-02-010

 

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Mo-Cu合金烧结和形变强化研究

 

胡保全, 王延忠, 刘和平

 

(中北大学 材料科学与工程学院, 山西 太原 030051)

 

摘要: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30 min, 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%。

 

关键词:机械合金化; Mo-Cu合金; 液相烧结; 形变强化

 

引用格式:HU Bao-quan, WANG Yan-zhong, LIU He-ping. Investigation on sintering and deformation strengthening of Mo-Cu alloy. Journal of Measurement Science and Instrumentation, 2017, 8(2): 173-177. [doi: 10.3969/j.issn.1674-8042.2017-02-010]

 

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