【摘要】：利用金相顯微鏡(OM)、X射線衍射(XRD)、掃描電鏡(SEM)和高溫拉伸對擠壓態(tài)ZM61-x Sn(x=2,4,8,質(zhì)量分?jǐn)?shù),%)合金的顯微組織、高溫力學(xué)性能和斷裂機(jī)制進(jìn)行了研究。結(jié)果表明添加Sn元素可有效細(xì)化合金組織且細(xì)化效果隨Sn含量的增加而增強(qiáng)。擠壓態(tài)ZM61-x Sn(x=2,4,8)合金的平均晶粒尺寸分別為11,8和4μm。隨Sn含量的增加,合金的力學(xué)性能先升高后降低。在所有的實(shí)驗(yàn)合金中ZM61-4Sn合金的強(qiáng)度最高,當(dāng)在180℃下進(jìn)行拉伸實(shí)驗(yàn)時,其極限抗拉強(qiáng)度和屈服強(qiáng)度分別為216和173 MPa。合金的延伸率隨Sn含量的增加而增加,當(dāng)拉伸溫度為300℃時,ZM61-x Sn(x=2,4,8)合金的延伸率分別為183.8%,235.8%和258.6%。ZM61-4Sn合金具有最好的強(qiáng)度和塑性的結(jié)合。試樣最后的斷裂主要由局部縮頸引起以及試樣的主要斷裂機(jī)制為顯微孔洞聚集。當(dāng)在260和300℃下拉伸時,合金發(fā)生了不完全的動態(tài)再結(jié)晶。
[Abstract]:The microstructure, high temperature mechanical properties and fracture mechanism of extruded ZM61-x Sn (xan2o4%, mass fraction,%) alloy were studied by (OM), X ray diffraction (XRD), scanning electron microscope (SEM) and high temperature tension. The results show that the addition of Sn elements can effectively refine the microstructure of the alloy and the refining effect increases with the increase of Sn content. The average grain size of the extruded ZM61-x Sn (XG _ 2O _ 4N _ 8) alloy is 11 渭 m and 4 渭 m, respectively. With the increase of Sn content, the mechanical properties of the alloy first increased and then decreased. The ultimate tensile strength and yield strength of ZM61-4Sn alloy were 216 and 173 MPa., respectively, when tensile tests were carried out at 180 鈩，

本文編號：2291713