( 1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. 長沙銅鋁材有限公司， 長沙 410014；
3. 中南大學(xué) 粉末冶金研究院， 長沙 410083)
摘 要: 采用金相顯微鏡、 布氏硬度儀以及激光熱導(dǎo)儀對三輥行星軋制過程中紫銅管的組織和性能進行研究。 結(jié)果表明： 在三輥行星軋制過程中， 先后存在著加工硬化和動態(tài)再結(jié)晶軟化兩個過程， 急劇大變形使粗大的銅晶粒破碎、 滑移并產(chǎn)生大量熱量， 致使變形區(qū)溫度急劇上升， 最終獲得了動態(tài)再結(jié)晶組織； 與組織轉(zhuǎn)變相對應(yīng)， 硬度值表現(xiàn)為隨變形量的增大而增加， 因加工硬化和動態(tài)再結(jié)晶的共同作用保持穩(wěn)定， 再結(jié)晶完成時硬度值下降； 由于空洞等缺陷在變形過程中被抵消， 材料的熱導(dǎo)率增大， 再結(jié)晶開始后， 晶粒變得細小， 熱導(dǎo)率下降。
關(guān)鍵字: 行星軋制； ACR紫銅管； 顯微組織； 硬度； 熱導(dǎo)率
ACR copper tube during three-roll
planetary milling process
HU Qi-ping1, PAN Zhi-yong1, 2
（ 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Changsha Copper and Aluminum Materials Company,
Changsha 410014, China;
3. Powder Metallurgy Research Institute, Central South University,
Changsha 410083, China）
Abstract: The microstructure and properties of the pure copper tube during the rolling process of a three-roll planetary mill were studied using optical microscope, Brinell's hardness measurements and laser-thermal rating measurements. The in-situ microstructure evolutions, resulting from both work-hardening and dynamic recrystallization softening during the three-roll planetary milling process were summarized systematically. The results show that, corresponded with the transformation of microstructure, the hardness increases along with the augmentation of the deformation, keeps fluctuation responsible for the coactions between the work-hardening and the dynamic recrystallization and drops when the recrystallization completes. The thermal conductivity of the copper tube increases, because the cavity and other defects are bucked in the processes of the deformation. After the recrystallization, the thermal conductivity decreases along with the diminution of the crystal grain.
Key words: three-roll planetary mill; ACR copper tube; microstructure; hardness; thermal conductivity
