High Temperature Mechanical Properties of the Copper Alloy

• Main Authors: Hsiang,ChihWei, 向志偉
• Other Authors: Chen,DaChih
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/61157596411902307823

碩士 === 國立宜蘭大學 === 機械與機電工程學系碩士班 === 99 === ABSTRACT In the plastic forming process, there are two forming processes. One forming process is in the room temperature and the other is in the high temperature. The deformation is limited forming in room temperature due to the strain hardness. Forming in the high-temperature process, a large deformation and less strain hardening are due to the recrystallization of the material. The numerical simulation describes the process of the forming state, but in the high-temperature forming process, it is hard to achieve the experimental result due to the absence of the high temperature mechanical properties of material is known. This study is focused on the high temperature mechanical properties of CuSn 0.15% copper alloy wire. The experiment process is started to put the copper alloy wire in the oven, then set to the required temperature. After the oven temperature raises to the set temperature, start the tensile test with constant speed. In the mean time, record loaded force of the load cell until the copper alloy wire is broken. Finally, measure the length of the wire and record the max load. From the record, one can have the tensile strength, true strain-true stress curve, strain hardening exponent and strength coefficient in different temperatures. Tabulate these data in various temperatures, and by using the curve-fitting method to have the mathematical relation equations for those curves. The results show that tensile strength was decreased while the work temperature raised and the elongation rates of copper alloy will be greatly increased while the temperature exceeds the recrystallization temperature. This study provides mathematical relation equations in terms of temperature for the true strain-true stress relations of the copper alloy. One can use these mathematical relationships to have the mechanical properties of the copper alloy for the numerical simulation. Keywords: Strain hardening exponent, High-temperature tensile test ,CuSn 0.15% copper alloy wire