本文關(guān)鍵詞： 鎂合金 溫成形 流變規(guī)律 最佳溫成形溫度 本構(gòu)模型　出處：《塑性工程學(xué)報》2015年01期 　論文類型：期刊論文

【摘要】：通過AZ31B鎂合金板材高溫拉伸實驗,分別討論了成形溫度、應(yīng)變速率以及各向異性對鎂合金流變的影響。實驗結(jié)果表明,溫度越高、應(yīng)變速率越低,鎂合金的塑性越好;取樣方向與軋制方向成45°時,由于在此方位孿生取向因子最大,因而該方向的塑性很高,與0°方向塑性基本相同。對變形后的鎂合金進行金相組織觀察發(fā)現(xiàn),250℃時鎂合金顯微組織幾乎都是由細小的等軸晶粒組成,優(yōu)于其他溫度下的顯微組織;結(jié)合溫度對鎂合金流變的影響,確定鎂合金的最佳溫成形溫度為250℃。依據(jù)實驗數(shù)據(jù)建立了兩種硬化本構(gòu)模型,即Fields-Backofen模型和指數(shù)模型。分別將兩種模型預(yù)測結(jié)果與實驗數(shù)據(jù)對比表明,采用指數(shù)模型能更好的預(yù)測鎂合金溫成形流變應(yīng)力。
[Abstract]:The effects of forming temperature, strain rate and anisotropy on the rheology of AZ31B magnesium alloy sheet were discussed by high temperature tensile test. The results showed that the higher the temperature, the lower the strain rate, the better the plasticity of magnesium alloy. When the sampling direction is 45 擄with the rolling direction, the plasticity of this direction is very high because the twin orientation factor is the largest in this direction. The microstructure of the deformed magnesium alloy is almost composed of fine equiaxed grains at 250 鈩，

本文編號：1510395