( 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 通過拉伸測試、顯微硬度測試、透射電鏡及掃描電鏡分析等手段研究了預(yù)變形對2519鋁合金組織與力學(xué)性能的影響。結(jié)果表明：預(yù)變形降低了合金于180 ℃時效第一階段的硬化效果, 提高了合金峰值硬度及強度，縮短了峰值時效時間。預(yù)變形合金強度、硬度的提高是由于θ′相的數(shù)目增加和尺寸減小。細小彌散的θ′相有利于阻礙位錯的運動，提高了合金的強度，同時也降低了合金的塑性。綜合考慮合金的強度和塑性，2519鋁合金時效前的預(yù)變形以15%為宜。
關(guān)鍵字: 2519鋁合金；預(yù)變形；時效；力學(xué)性能；顯微組織
2519 aluminum alloy
ZHOU Zhuo-ping，GONG Min-ru
（ School of Materials Science and Engineering，
Central South University，Changsha 410083，China）
Abstract: The effect of pre-deformation on the microstructures and mechanical properties of 2519 aluminum alloy were investigated by means of tensile test, microhardness test, transmission electron microscope and scanning electron microscope. The results show that the pre-deformation decreases the hardening effect of the first stage, increases the peak hardness and tensile strength and reduces the time of peak aged at 180 ℃. The peak hardness and tensile strength of the pre-deformed alloy are increased because of quantity increasing and refinement of θ′ phase. The fined and dispersed θ′ phase can strongly retard the movement of dislocations, improve the tensile strength of the alloys, at the same time, the plasticity of the alloy is decreased. The pre-deformation of 15% for 2519 aluminum alloy is better according its tensile strength and plasticity
Key words: 2519 aluminum alloy; pre-deformation; ageing; mechanical properties; microstructure
