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材料工程  2004, Vol. 0 Issue (11): 18-21,27    
  研究与应用 本期目录 | 过刊浏览 | 高级检索 |
不同晶粒尺寸的三元Cu40Ni40Cr20合金的制备及其显微组织研究
曹中秋1,2, 牛焱1, 王崇琳1, 吴维(山文)1
1. 中国科学院金属研究所金属腐蚀与防护国家重点实验室, 沈阳, 110016;
2. 沈阳师范大学化学系, 沈阳, 110034
Study of Preparation and Microstructure of Cu40Ni40Cr20 Alloys with Different Grain Size
CAO Zhong-qiu1,2, NIU Yan1, WANG Chong-lin1, WU Wei-tao1
1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Shenyang,110016, China;
2. Department of Chemistry, Shenyang Normal University, Shenyang 110034, China
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摘要 采用电弧熔炼和机械合金化,随后在750℃,58MPa下热压制备了晶粒尺寸差别较大的Cu40Ni40Cr20合金,用X射线衍射仪、扫描电镜等分析手段对比研究了显微组织结构.结果表明:电弧熔炼制备的晶粒尺寸较大的Cu40Ni40Cr20合金为二相,组织极其不均匀;采用机械合金化,通过控制热压条件制备的纳米晶Cu40Ni40Cr20合金仍为双相,但显微组织均匀,稳定.随着球磨时间的延长,由于晶粒细化和应变的结果,衍射峰偏移并有明显的宽化产生,Cu在Cr或Cr在Cu中的固溶度明显增加,当球磨60h后,合金已由双相变成亚稳态的单相.由于机械合金化的粉末处于非平衡态,其超固溶度溶质随热压和真空退火过程的进行会慢慢脱溶分解出来,合金已由单相变为两相,两相颗粒均成倍长大,但仍然保持纳米级尺度;机械合金化、热压和退火后样品中Cu,Ni和Cr的晶格均未发生崎变;讨论了晶粒细化对合金显微组织的影响.
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曹中秋
牛焱
王崇琳
吴维(山文)
关键词 Cu-Ni-Cr合金晶粒尺寸显微组织    
Abstract:The Cu40Ni40Cr20 bulk alloys with much different grain size have been prepared respectively by conventional arc-melting (CA) and mechanical alloying (MA) . Their micro-structural characteristics were investigated by X-ray diffraction (XDR), scanning electron microscopy(SEM) and energy-dispersive X-ray microanalysis (EDX). The results show that the microstructure of CA Cu40Ni40Cr20 is composed of double phases but extremely not uniform, while that of MA Cu40Ni40Cr20 is also composed of double phases but uniform with excellent density. With increase of ball milling time, the X-ray diffraction peaks have a deviation and become wide because of fine grain size and internal stress whereas the solid solubility of Cu in Cr and Cr in Cu increased evidently. When powders are milled for 60h, the alloyed powers have become single solid solution. Because the mechanically alloyed powders are in non-equilibrium state, the solute super-saturation decompose slowly with hot pressing and annealing in vacuum and finally the alloys transformed double-phases from single phase solid solution. The sizes of the two phases particles increased but still remained nano-size range. The lattices of copper, nickel and chromium do not produce distortion in the course of mechanical alloying, hot pressing mechanically alloyed powders and annealing. The effect of grain size on alloys microstructure was discussed in detail.
Key wordsCu-Ni-Cr alloy    grain size    microstructure
收稿日期: 2003-10-08      出版日期: 2004-11-20
中图分类号:  TB383  
  TF12  
基金资助:国家自然科学基金资助项目(50271079)辽宁省教委科研基金(202112022)
作者简介: 曹中秋(1965- ),男,教授,博士,研究方向为材料制备及腐蚀与防护,联系地址:中国科学院金属研究所(110016).
引用本文:   
曹中秋, 牛焱, 王崇琳, 吴维(山文). 不同晶粒尺寸的三元Cu40Ni40Cr20合金的制备及其显微组织研究[J]. 材料工程, 2004, 0(11): 18-21,27.
CAO Zhong-qiu, NIU Yan, WANG Chong-lin, WU Wei-tao. Study of Preparation and Microstructure of Cu40Ni40Cr20 Alloys with Different Grain Size. Journal of Materials Engineering, 2004, 0(11): 18-21,27.
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