(江西理工大學(xué) 材料科學(xué)與工程學(xué)院，贛州 341000)
摘 要: 采用原位反應(yīng)合成技術(shù)制備了Cu-1.12%Al2O3合金(質(zhì)量分?jǐn)?shù))，通過(guò)力學(xué)性能、導(dǎo)電率測(cè)試及顯微組織觀察系統(tǒng)研究該合金的冷變形行為。結(jié)果表明：對(duì)熱擠壓態(tài)合金進(jìn)行不同變形量的冷拉抜加工處理后，合金的硬度和強(qiáng)度均隨變形量的增大而增加，合金加工硬化現(xiàn)象明顯，但導(dǎo)電率的變化甚微；冷加工使合金的致密度和位錯(cuò)密度獲得進(jìn)一步的提升，同時(shí)由于Al2O3粒子的釘扎位錯(cuò)和阻礙晶界滑移作用，出現(xiàn)位錯(cuò)線纏結(jié)和位錯(cuò)塞積，并發(fā)展成為變形位錯(cuò)胞組織和亞晶組織。
關(guān)鍵字: Cu-1.12%Al2O3合金；冷加工行為；力學(xué)性能；顯微組織
（School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China）
Abstract:Cu-1.12%Al2O3 composite was fabricated by in-situ reactive synthesis technology, and its cold deformation behavior was studied by mechanical property measurement, electrical conductivity test and microstructure observation, respectively. The results show that the rockwell hardness and strength increase with increasing the cold deformation of as-extruded Cu-1.12%Al2O3 alloy, and the work hardening phenomenon is obvious, but the change of electrical conductivity is very small. The density and dislocation density of Cu-1.12%Al2O3 alloy further increase after cold deformation. Since the tiny alumina particles can pin dislocation and hinder the grain boundary motion, the dislocation tangle and dislocation pileup generate, and then develop into the dislocation cell or subgrain.
Key words: Cu-1.12%Al2O3 alloy; cold drawing behavior; mechanical property; microstructure
