基金Project(51271203)supported by the National Natural Science Foundation of ChinaProject(CX2012B037)supported by the Hunan Provincial Innovation Foundation for Postgraduate,China+1 种基金Project(2013zzts017)supported by the Graduate Degree Thesis Innovation Foundation of Central South University,ChinaProject(2012bjjxj015)supported by the Excellent Doctor Degree Thesis Support Foundation of Central South University,China
文摘采用Gleeble-1500热模拟实验机在温度为600~800°C、应变速率为0.01~10 s-1的热变形条件下对新型无镍白色Cu-12Mn-15Zn-1.5Al-0.3Ti-0.14B-0.1Ce(质量分数,%)合金进行热压缩模拟实验;根据该合金热变形行为及热加工特征,建立该合金热变形的本构方程和热加工图。该合金热变形过程中变形激活能为203.005 k J/mol。当真应变为0.7时,合金热加工图中存在一个失稳区,此区域的变形温度为600~700°C,应变速率为0.32~10 s-1。在较适宜的热变形条件(800°C、10 s-1)下获得的合金具有良好的表面质量和内部组织。同时,该无镍合金具有与传统镍白铜Cu-15Ni-24Zn-1.5Pb合金相近似的白色色度和肉眼不易察觉的色差(小于1.5)。