冷加工變形量對Al2O3-彌散強化銅合金組織與性能的影響

冷加工變形量對Al2O3-彌散強化銅合金組織與性能的影響Effect of cold deformation on microstructures and properties of Al2O3-dispersion strengthened copper

采用原位反應(yīng)合成技術(shù)制備了Cu-1.12%Al2O3合金(質(zhì)量分數(shù))，通過力學(xué)性能、導(dǎo)電率測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：對熱擠壓態(tài)合金進行不同變形量的冷拉抜加工處理后，合金的硬度和強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密度獲得進一步的提升，同時由于Al2O3粒子的釘扎位錯和阻礙晶界滑移作用，出現(xiàn)位錯線纏結(jié)和位錯塞積，并發(fā)展成為變形位錯胞組織和亞晶組織。

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.

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