镁铝锰系合金含锰粒子控制工艺及组织与性能的研究

发布时间：2018-05-18 01:02

  本文选题：Mg-Al-Mn系镁合金 + 含锰粒子　； 参考：《青海大学》2015年硕士论文

【摘要】：本文采用低成本的重力铸造法制备了Mg-Al-Mn系镁合金,并对Mg-Al-Mn系合金中含锰粒子控制工艺及其组织与性能的关系进行了研究。通过金相显微镜(OM),X射线衍射(XRD),扫描电镜(SEM),电子探针(EPMA)、万能试验机等设备对材料的微观组织和室温力学性能进行表征和测试,研究了不同工艺参数对镁合金中含锰粒子、微观组织及力学性能的影响。铸态Mg-Al-Mn系镁合金的组织主要由初生α-Mg固溶体、β-Mg17Al12金属间化合物和含锰粒子组成。含锰粒子的成分主要为Al-Mn相,主要为Al8Mn5和Al11Mn4,Al8Mn5主要以颗粒状存在,Al11Mn4以不规则块状和棒状的形式出现。另外,小部分含锰粒子中含有Fe,为Alx(Fe,Mn)y相。通过正交试验结果及不同工艺参数对镁合金中含锰粒子、微观组织及力学性能的影响分析,获得了制备Mg-Al-Mn系合金的最优工艺,即:含Mn量0.3%,模具温度180℃,浇注温度680℃,静置时间60min。固溶处理后合金的硬度与铸态时的硬度相比有所下降,固溶时间7h时,硬度最低为71HBS;随着时效时间的延长,试样的硬度值呈先升高后降低的趋势,时效时间3h时,硬度获得最高82HBS。通过试验和分析,选取本课题探索的工艺参数并严格控制镁合金熔液冶金质量,制备了AM60B合金铸锭。铸态AM60B合金中Mn粒子平均尺寸为4.9?m,单位面积(1/mm2)内平均含有58个,面积分数为0.29%。挤压态AM60B合金抗拉强度达到291MPa,屈服强度达到200MPa,伸长率达到了13.8%。验证了试验的正确性和试验数据的可靠性,进一步为Mg-Al-Mn系镁合金的工业化生产提供实践根据和理论依据。
[Abstract]:In this paper, Mg-Al-Mn series magnesium alloys were prepared by low cost gravity casting method. The control process of manganese particles in Mg-Al-Mn series alloys and the relationship between microstructure and properties were studied. The microstructure and room temperature mechanical properties of magnesium alloy were characterized and tested by means of metallographic microscope (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), electron probe EPMA (EPMA) and universal testing machine. The effects of different process parameters on manganese content in magnesium alloy were studied. Influence of microstructure and mechanical properties. The microstructure of as-cast Mg-Al-Mn magnesium alloy is mainly composed of primary 伪 -Mg solid solution, 尾 -Mg17Al12 intermetallic compound and manganese containing particles. The main composition of manganese containing particles is Al-Mn phase, Al8Mn5 and Al11Mn4Al8Mn5 mainly exist in granular form. Al11Mn4 appears in irregular block and rod form. In addition, a small number of manganese containing particles contain Fe, which is Al _ XO _ Fe _ 2O _ y phase. Based on the results of orthogonal test and the effect of different process parameters on the manganese content, microstructure and mechanical properties of magnesium alloy, the optimum process of preparing Mg-Al-Mn alloy was obtained, namely: mn content 0.33%, mold temperature 180 鈩，

本文编号：1903662