(大連交通大學(xué) 連續(xù)擠壓工程研究中心，大連 116028)
摘 要: 采用金相顯微鏡、維氏硬度儀和萬能實驗機對H65黃銅合金連續(xù)擠壓過程中的組織和性能演變特征進行研究。結(jié)果表明：連續(xù)擠壓過程中合金發(fā)生了強烈的剪切變形，產(chǎn)生大量的位錯和位錯纏結(jié)，形成取向差較小的亞晶結(jié)構(gòu)；隨著變形程度的加劇，合金的溫度升高，促進了動態(tài)再結(jié)晶的發(fā)生，小角度晶界通過吸收位錯等方式長大成大角度晶界，使亞晶逐漸轉(zhuǎn)變成細小均勻的等軸晶，有效地提高了材料的綜合性能。這種組織的演變在力學(xué)實驗中得到證明。
關(guān)鍵字: H65黃銅合金；連續(xù)擠壓；組織演變；動態(tài)再結(jié)晶
H65 brass alloy during continuous extrusion process
（Engineering Research Center of Continuous Extrusion, Dalian Jiaotong University, Dalian 116028, China）
Abstract:The microstructure and properties evolution of H65 brass alloy during continuous extrusion were observed by OM, hardness-testing devices and universal-testing machine. The results show that severe plastic deformation (SPD) occurs in continuous extrusion of H65 brass alloy. A large number of dislocation and dislocation twins form. The sub-crystallization structure can be achieved. With increasing friction and temperature, the dynamic recrystallization occurs. After that, the low angle boundaries grow up to high angle boundaries through absorbing dislocation power. The homogeneous grain can be achieved. Continuous extrusion improves the properties of the material effectively. The microstructure evolution is demonstrated in the mechanical property experiments.
Key words: H65 brass alloy; continuous extrusion; microstructure evolution; dynamic recrystallization
