作者机构：
[Lv Xi Jian; Zhao Ruilan; Tang De Wen; Liu Jun] Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.
会议名称：
5th International Conference on Measurement, Instrumentation and Automation (ICMIA)
会议时间：
SEP 17-18, 2016
会议地点：
Shenzhen, PEOPLES R CHINA
会议主办单位：
[Tang De Wen;Zhao Ruilan;Lv Xi Jian;Liu Jun] Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.
会议论文集名称：
Advances in Intelligent Systems Research
关键词：
Milling force;milling temperature;finite element model
摘要：
Both milling force and temperature are the key influence factor of thin-wall part deformation. Therefore, to study the influence of milling parameters including milling speed, feed per tooth, radial depth of cutting and axial depth of cutting on milling force and temperature in the cutting process,the finite element model of high speed milling thin-wall SDK11 hardened steel part is developed by DEFORM-3D based on the modified J-C material model. The results indicate that milling force increases with an increase of milling speed until milling speed beyond 400m/min began to decline, and milling temperature increases with an increase of cutting speed. Milling force rises with fluctuations with an increase of milling speed, and milling temperature increases with an increase of milling feed, But it appears a decline trend from milling feed of 0.02mm/z to 0.025mm/z. Both milling force and temperature are increasing with the radial and axial depth of cut increasing. but milling force decline and milling temperature increase rapidly from axial depth of 0.7mm to 0.8mm.
摘要：
Zirconium (Zr) is an important alloying element to Mg-Zn-based alloy system. In this paper, we report the formation of the β-type precipitates on the nanoscale Zr-rich particles in a Mg-6Zn-0.5Cu-0.6Zr alloy during ageing at 180°C. Scanning transmission electron microscopy examinations revealed that the nanoscale Zr-rich [0001]α rods/laths are dominant in the Zr-rich core regions of the as-quenched sample after a solution treatment at 430°C. More significantly, these Zr-rich particles served as favourable sites for heterogeneous nucleation of the Zn-rich β-type phase during subsequent isothermal ageing at 180°C. This research provides a potential route to engineer precipitate microstructure for better strengthening effect in the Zr-containing Mg alloys.
