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NSYSU

1. Lee, Wen-Tu. The Production and Deformation Behaviour of Ultrafine-Grained AZ31 Mg Alloy.

Degree: PhD, Materials and Optoelectronic Science, 2011, NSYSU

Ultrafine-grained(UFG) AZ31 Mg alloy was obtained by equal-channel angular extrusion(ECAE) and subsequent annealing at elevated temperatures. The basal texture component for ECAEed material is located on the Z plane of the ECAEed billets. Tensile tests were performed at temperatures between room temperature and 125â, and strain rates used ranging from 3*10-5 to 6*10-2 s-1. The experimental results showed that a high tensile yield stress of 394 MPa was obtained at room temperature under a strain rate of 3*10-3 s-1. Strengths of UFG AZ31 specimens were greatly improved due to grain refinement. It was found that strain rate sensitivity of UFG AZ31 alloy increased significantly from 0.024 to 0.321 with increasing temperature. The constant k of Hall-Petch equation, Ï=Ï0 +kd-1/2, decreased with increasing temperature, and decreasing strain rate. Negative k values were ontained at 75â and 100â under a strain rate 3*10-5 s-1. When compressed along X, Y and X45Z billet orientations, strain localization within shear bands was found in UFG AZ31 specimens. Shear bands are formed inclined near 45 to the compression axis. The smaller the grain size, the thinner the shear band. Different Hall-Petch constant k were found in specimens deformed along different orientations, which is caused by different deformation mechanisms. The formation of tension twins is the primary deformation mechanism for compressed X and Y samples, and basal slip is responsible for the deformation of X45Z sample. tension twins were found in 0.46 μm grain size specimens. Advisors/Committee Members: Po-We Kao (chair), Jian-Yin Wang (chair), Chih-Pu Chang (committee member), Der-Shin Gan (chair), Li-Hui Chang (chair).

Subjects/Keywords: Equal-channel angular extrusion(ECAE); Grain refinement; Ultra-Fined Grain; Mg alloy; Shear Band

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lee, W. (2011). The Production and Deformation Behaviour of Ultrafine-Grained AZ31 Mg Alloy. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0831111-151623

Chicago Manual of Style (16th Edition):

Lee, Wen-Tu. “The Production and Deformation Behaviour of Ultrafine-Grained AZ31 Mg Alloy.” 2011. Doctoral Dissertation, NSYSU. Accessed April 23, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0831111-151623.

MLA Handbook (7th Edition):

Lee, Wen-Tu. “The Production and Deformation Behaviour of Ultrafine-Grained AZ31 Mg Alloy.” 2011. Web. 23 Apr 2019.

Vancouver:

Lee W. The Production and Deformation Behaviour of Ultrafine-Grained AZ31 Mg Alloy. [Internet] [Doctoral dissertation]. NSYSU; 2011. [cited 2019 Apr 23]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0831111-151623.

Council of Science Editors:

Lee W. The Production and Deformation Behaviour of Ultrafine-Grained AZ31 Mg Alloy. [Doctoral Dissertation]. NSYSU; 2011. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0831111-151623

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