| 引用本文: | 王传杰,王春举,程利冬,郭斌,单德彬.T2紫铜微正挤压件表面形貌与微观组织分析[J].材料科学与工艺,2013,21(5):139-142.DOI:10.11951/j.issn.1005-0299.20130523. |
| WANG Chuan-jie,WANG Chun-ju,CHENG Li-dong,GUO Bin,SHAN De-bin.Surface topography and microstructure analysis in micro forward extrusion parts of T2 copper[J].Materials Science and Technology,2013,21(5):139-142.DOI:10.11951/j.issn.1005-0299.20130523. |
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| 摘要: |
| 为便于取出微正挤压零件,设计了具有分瓣式结构的微正挤压凹模,并成功成形出最小挤出杆直径为0.25 mm的微正挤压件.采用扫描电子显微镜(SEM)及金相显微镜对微正挤压件的表面形貌及微观组织进行了观察。结果表明,随着挤出杆尺寸的减小或晶粒尺寸的增大,内外层材料的非均匀塑性变形程度增加;当挤出杆尺寸降低到亚毫米尺度时,微挤压成形件发生了一定弯曲;微正挤压件纵向和横向微观组织的非均匀分布表明,在微正挤压成形过程中材料在纵向和横向上都经历了严重的非均匀塑性变形.材料的非均匀塑性变形程度是随着挤出杆尺寸的减小或晶粒尺寸的增加而不断增加的. |
| 关键词: 微成形 正挤压 尺寸效应 T2紫铜 表面形貌 微观组织 非均匀变形 |
| DOI：10.11951/j.issn.1005-0299.20130523 |
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| 基金项目:国家自然科学基金(50835002;50805035)；黑龙江省科技计划青年基金项目(QC08C55)；高等学校博士学科点专项科研青年基金项目(200802131031). |
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| Surface topography and microstructure analysis in micro forward extrusion parts of T2 copper |
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WANG Chuan-jie1,WANG Chun-ju1,CHENG Li-dong2,GUO Bin1,SHAN De-bin1
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(1.School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China; 2.School of Mechatronics Engineering,Harbin Institute of Technology,Harbin 150001,China)
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| Abstract: |
| A separated female die in micro forward extrusion was designed according to the characteristics of micro-forming, and a minimum pin with 0.25 mm in diameter was extruded successfully. Surface topography and microstructure analysis of micro forward extruded parts was conducted by scanning electron microscope (SEM) and metallurgical microscope. The results indicate that inhomogeneous deformation between inner and out layer materials tends to increase with the decrease of pin size or increase of grain size. Micro forward extruded pins tend to curve with the decrease of specimen dimensions；Microstructure distribution of micro parts in the landscape and fore-and-aft orientation indicate the inhomogeneity of deformation in micro forward extrusion. |
| Key words: micro-forming forward extrusion size effect T2 copper surface topography microstructure inhomogeneous deformation |
