【摘要】：通過塑性變形裝置實(shí)現(xiàn)了擠壓態(tài)ZK60鎂合金往復(fù)擠壓實(shí)驗(yàn),探討了顯微組織演變過程和力學(xué)性能變化。結(jié)果表明:相比初始擠壓態(tài),350℃往復(fù)擠壓后各個道次的試樣具有更加優(yōu)良的顯微組織和力學(xué)性能。隨擠壓道次增加,顯微組織晶粒更加細(xì)化,等軸細(xì)小晶粒增多,組織均勻性不斷提高;拉伸斷口形貌顯示隨著道次增加,韌窩數(shù)量與深度明顯增加,變形能力提高顯著。拉伸實(shí)驗(yàn)數(shù)據(jù)表明,往復(fù)擠壓很大程度上改善了ZK60鎂合金的力學(xué)性能,特別是塑性變形能力。1道次往復(fù)擠壓后,徑向硬度都比原始態(tài)高,并隨溫度升高有下降的趨勢,軸向硬度也隨著溫度升高而降低,390℃下試樣軸向硬度與初始樣硬度值接近;350℃下不同道次往復(fù)擠壓后,試樣中部徑向、軸向硬度隨道次增大而降低,而頸部徑向硬度呈不規(guī)律性變化。
[Abstract]:The reciprocating extrusion experiment of extruded ZK60 magnesium alloy was carried out by plastic deformation device, and the evolution process of microstructure and the change of mechanical properties were discussed. The results show that the microstructure and mechanical properties of the samples after repeated extrusion at 350 鈩，

本文編號：2528113