【摘要】：AZ81鎂合金在汽車行業(yè)應(yīng)用廣泛,但存在組織粗大,力學(xué)性能差等缺點(diǎn)。等通道轉(zhuǎn)角擠壓(ECAP)法是細(xì)化晶粒,提高鎂合金性能的有效途徑。在300℃下對AZ81鎂合金進(jìn)行了1~6道次ECAP擠壓,并分析了AZ81鎂合金在ECAP擠壓變形過程中微觀組織與力學(xué)性能隨擠壓道次的變化規(guī)律。結(jié)果表明,隨著擠壓道次的增加,基體晶粒尺寸先減小后增加,4道次時細(xì)化程度最高;合金硬度先增大后減小,4道次時合金硬度最高,達(dá)到142HL;合金的抗拉強(qiáng)度伸長率逐漸增強(qiáng)后減小,再增大,6道次時合金的綜合拉伸性能達(dá)到最高,抗拉強(qiáng)度210 MPa,伸長率15.8%。
[Abstract]:AZ81 magnesium alloy is widely used in automobile industry, but it has some disadvantages such as coarse microstructure and poor mechanical properties. Equal channel angular extrusion (ECAP) is an effective way to refine the grain and improve the properties of magnesium alloys. AZ81 magnesium alloy was extruded at 300 鈩，

本文編號：2159154