(中南工業(yè)大學 材料科學與工程系， 長沙 410083)
摘 要: 制備了CuZn和CuZnCrZr兩種合金，用Gleeble-1500測定它們在恒溫和恒速下的穩(wěn)態(tài)變形抗力，繪制成lnσ—lnε和lnσ—1/T關系曲線，從而確定合金的變形激活能Q和應力指數(shù)n，并觀察了熱變形組織。結(jié)果表明：在Cu13Zn合金中加入0.1%Zr和0.1%Cr，對合金的動態(tài)再結(jié)晶有強烈抑制作用，合金在650～820℃之間熱變形為不完全動態(tài)再結(jié)晶組織，而Cu13Zn合金在750～820℃之間為完全動態(tài)再結(jié)晶組織。與此相對應，CuZn合金熱變形激活能在650～700℃溫度段為367 kJ/mol，在750～820 ℃溫度段為252 kJ/mol；而CuZnZrCr合金始終保持為366 kJ/mol。
關鍵字: 銅合金；熱變形激活能；動態(tài)再結(jié)晶
（Department of Materials Science and Engineering,
Central South University of Technology, Changsha 410083, P.R.China）
Abstract: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 lnσ—lnε and lnσ—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 366kJ/mol at 650～820 ℃ for Cu13Zn0. 1Zr0.1Cr alloy.
Key words: copper alloy; thermal deformation activity energy; dynamic recrystallization
