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 Please use this identifier to cite or link to this item: `http://ir.lib.ncu.edu.tw/handle/987654321/66000`

 Title: A1070在累進式背擠製下的機械性質與微結構之研究 Authors: 陳弘志;Chen,Hung-chih Contributors: 機械工程學系 Keywords: 累進式背擠製;機械性質;微結構 Date: 2014-08-28 Issue Date: 2014-10-15 17:20:34 (UTC+8) Publisher: 國立中央大學 Abstract: 本文對於累進式背擠製(accumulative back extrusion, ABE)製程作出探討，利用自行設計之模具，以實驗的方式對鋁材1070 變形前後的機械性質與微結構的作出探討。在實驗中，以不同的變形比(deformation ratio)與沖頭行程(die stroke)兩大實驗參數互相搭配下， 對其機械性質與微結構進行探討，機械性質部分主要討論其硬度(hardness)變化，而微結構的部分針對晶粒細化後的晶粒大小(grain size)與晶界取向差異角度(misorientation angle of grain boundaries)進行探討。實驗結果顯示，越大的變形比與沖頭行程可產生較大的塑性變形，會產生硬度的提升、晶粒細化的現象與高晶界取向差異角度的提升。;This article is focus on a manufacturing process calledaccumulative back extrusion, its experiments are done withaluminum 1070 and some self-designed molds. The differences of the mechanical property and the microstructure between before and after forming are investigated.The two main parameters in experiments, deformation ratioand die stroke, are operating in mutual. The discussion ofmechanical property is focus on the change of hardness. And the part of microstructure is about grain size and themisorientation.The results reveal that the larger deformation ratio and diestroke are, the more plastic deformation are. And that will cause the elevation of hardness, the phenomenon of grain refining and the raise of high misorientation angle of grain boundaries. Appears in Collections: [Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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