等径角挤压对Al-5Ti-1B合金中第二相的影响
Effects of Equal Channel Angular Pressing on the Second Phases of Al-5Ti-1B Alloy
摘 要
在室温下对Al-5Ti-1B合金进行8道次等径角挤压试验,并运用X射线衍射仪、光学显微镜和扫描电镜等手段研究了变形前后Al-5Ti-1B合金中第二相的变化.结果表明：等径角挤压可以使Al-5Ti-1B合金中第二相颗粒细化,并改善了第二相颗粒分布的均匀性;随挤压次数的增加,大块状TiAl3相由20～80 μm粗晶粒细化到5 μm左右;呈团块状且分布不均的TiB2经挤压后得到均匀分布;硬颗粒第二相同时对基体有剪切作用,这也是晶粒细化的原因之一.
晶粒细化
Al-5Ti-1B合金
第二相
equal channel angular pressing
grain refine
Al-5Ti-1B alloy
second phase
Abstract
Al-5Ti-1B alloy was deformed by equal channel angular pressing (ECAP) with the number of pressing passes being 8 at room temperature.The X-ray diffraction,optical microscope and scanning electronic microscope were used to investigate the change of the second phases in Al-5Ti-1B alloy before and after ECAP deformation.The results indicate that the grain size of the second phase in Al-5Ti-1B alloy are obviously refined and more homogeneous.With the increase of pressing passes,the grain sizes of TiAl3 phase are refined from 20-80 μm to about 5 μm,and the grains of TiB2 phase are more homogeneous.The shearing action of hard second phase particles in matrix is one of the reasons of the grain refinement.
中图分类号 TG146
所属栏目
基金项目 湖南省自然科学基金资助项目(06JJ50137);衡阳市科委科研计划资助项目(06Kj02)
收稿日期 2007/7/23
修改稿日期 2007/10/6
网络出版日期
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备注刘先兰(1966-),女,湖南衡阳人,副教授,博士研究生.
引用该论文: LIU Xian-lan,ZHANG Wen-yu,HU Zhi-liu,LIU Chu-ming. Effects of Equal Channel Angular Pressing on the Second Phases of Al-5Ti-1B Alloy[J]. Materials for mechancial engineering, 2008, 32(6): 8～10
刘先兰,张文玉,胡治流,刘楚明. 等径角挤压对Al-5Ti-1B合金中第二相的影响[J]. 机械工程材料, 2008, 32(6): 8～10
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参考文献
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【4】张柏清,马洪涛,李建国,等.变形对中间合金细化剂组织及细化性能的影响[J].金属热处理,1999(6):1-2.
【5】刘相法,杨 阳,边秀房,等.杆状AlTiB中间合金的组织形貌及晶粒细化行为的研究[J].铸造,1996(10):6-9.
【6】Mayes C D,McCartney D G,Tatlock G J.Influence of microstructure on grain refining performance of Al-Ti-B master alloys[J].MaterSci and Tech,1993,9(2):97-103.
【7】刘相法,边秀房,李 辉,等.AlTiB中间合金细化效果的组织遗传效应[J].金属学报,1996,32(2):149-153.
【8】Segal V M.Severe plastic deformation simple shear versus pure shear[J].Materials Science and Engineering,2002,A338:331-334.
【9】Valiev R Z,Islamgaliev R K,Alexandrov I V.Bulk nano-structured materials from severe plastic deformation[J].Progressin Materials Science,2000,45:103-189.
【10】Furukaw A M,Iwahashi Y,Horita Z,et al.Shearing characteristics associated with equal-channel angular pressing[J].Mater Sci Eng,1998,A257:328-332.
【11】Iwahashi Y,Horita Z,Nemoto M,et al.An investigation of microstructural evolution during equal channel angular pressing[J].Acta Mater,1997,45(11):4733-4741.
【12】刘先兰.等径角挤压法制备块体超细晶材料的工艺研究[D].南宁:广西大学,2006.
【13】ValievR Z,IslamgalievR K,AlexandrovI V.Bulk nanostructured materials from severe plastic deformation[J].Process in Materials Science,2000,45:103-189.
【14】Chang J Y,Yoon J S,Kim G H.Development of submicron sized grain during cyclic equal channel angular pressing[J].Scripta Mater,2001,45(3):347-354.
【15】Ferrasse S,Segal V M,Hartwig K T,et al.Development of a submicrometer grained microstructure in aluminum 6061 using equal channel angular extrusion[J].J Mater Res,1997,12:1253-1261.
【16】Valiev R Z,Komikov A V,Mulyokov R R.Structure and properties of ultrafine-grained materials produced by severe plastic deformation[J].Mater Sci Eng,1993,A168:141-148.
【17】毕见强.2A12铝块体超细晶材料的制备、模拟及细化机制的研究[D].济南:山东大学,2005.
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