摘要
制备了CuZn和CuZnCrZr两种合金 ,用Gleeble 1 50 0测定它们在恒温和恒速下的稳态变形抗力 ,绘制成lnσ—ln ε和lnσ— 1 /T关系曲线 ,从而确定合金的变形激活能Q和应力指数n ,并观察了热变形组织。结果表明 :在Cu1 3Zn合金中加入 0 .1 %Zr和 0 .1 %Cr,对合金的动态再结晶有强烈抑制作用 ,合金在 650～ 82 0℃之间热变形为不完全动态再结晶组织 ,而Cu1 3Zn合金在 750～ 82 0℃之间为完全动态再结晶组织。与此相对应 ,CuZn合金热变形激活能在 650～ 70 0℃温度段为 367kJ/mol,在 750～ 82 0℃温度段为 2 52kJ/mol;而CuZnZrCr合金始终保持为 366kJ/mol。
Cu13Zn and Cu13Zn0.1Zr0.1Cr alloys were prepared. The stable state deformation stresses of these alloys were studied by Gleeble 1500 at constant temperatures and constant strain speeds. The ln σ —ln and ln σ —1/ T curves were calculated, and the hot deformation microstructures were observed. The results showed that the dynamic recrystallization of Cu13Zn is restrained intensively with the additions of 0.1%Zr and 0.1%Cr. A partial dynamic recrystallization structure is remained for Cu13Zn0.1Zr0.1Cr alloy deformed at 650～820 ℃, whereas a completed recrystallization for Cu13Zn alloy at 750～820 ℃. Accordingly, the hot deformation activity energy is 367 kJ/mol at 650～700 ℃ and is 252 kJ/mol at 750～820 ℃ for Cu13Zn alloy, and that is 366 kJ/mol at 650～820 ℃ for Cu13Zn0.1Zr0.1Cr alloy.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2000年第1期12-16,共5页
The Chinese Journal of Nonferrous Metals
关键词
铜合金
热变形激活能
动态再结晶
copper alloy
thermal deformation activity energy
dynamic recrystallization
