本文選題：Mg-Al-Mn系鎂合金 + 含錳粒子　； 參考：《青海大學(xué)》2015年碩士論文

【摘要】：本文采用低成本的重力鑄造法制備了Mg-Al-Mn系鎂合金,并對(duì)Mg-Al-Mn系合金中含錳粒子控制工藝及其組織與性能的關(guān)系進(jìn)行了研究。通過金相顯微鏡(OM),X射線衍射(XRD),掃描電鏡(SEM),電子探針(EPMA)、萬能試驗(yàn)機(jī)等設(shè)備對(duì)材料的微觀組織和室溫力學(xué)性能進(jìn)行表征和測(cè)試,研究了不同工藝參數(shù)對(duì)鎂合金中含錳粒子、微觀組織及力學(xué)性能的影響。鑄態(tài)Mg-Al-Mn系鎂合金的組織主要由初生α-Mg固溶體、β-Mg17Al12金屬間化合物和含錳粒子組成。含錳粒子的成分主要為Al-Mn相,主要為Al8Mn5和Al11Mn4,Al8Mn5主要以顆粒狀存在,Al11Mn4以不規(guī)則塊狀和棒狀的形式出現(xiàn)。另外,小部分含錳粒子中含有Fe,為Alx(Fe,Mn)y相。通過正交試驗(yàn)結(jié)果及不同工藝參數(shù)對(duì)鎂合金中含錳粒子、微觀組織及力學(xué)性能的影響分析,獲得了制備Mg-Al-Mn系合金的最優(yōu)工藝,即:含Mn量0.3%,模具溫度180℃,澆注溫度680℃,靜置時(shí)間60min。固溶處理后合金的硬度與鑄態(tài)時(shí)的硬度相比有所下降,固溶時(shí)間7h時(shí),硬度最低為71HBS;隨著時(shí)效時(shí)間的延長,試樣的硬度值呈先升高后降低的趨勢(shì),時(shí)效時(shí)間3h時(shí),硬度獲得最高82HBS。通過試驗(yàn)和分析,選取本課題探索的工藝參數(shù)并嚴(yán)格控制鎂合金熔液冶金質(zhì)量,制備了AM60B合金鑄錠。鑄態(tài)AM60B合金中Mn粒子平均尺寸為4.9?m,單位面積(1/mm2)內(nèi)平均含有58個(gè),面積分?jǐn)?shù)為0.29%。擠壓態(tài)AM60B合金抗拉強(qiáng)度達(dá)到291MPa,屈服強(qiáng)度達(dá)到200MPa,伸長率達(dá)到了13.8%。驗(yàn)證了試驗(yàn)的正確性和試驗(yàn)數(shù)據(jù)的可靠性,進(jìn)一步為Mg-Al-Mn系鎂合金的工業(yè)化生產(chǎn)提供實(shí)踐根據(jù)和理論依據(jù)。
[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 偽 -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，

本文編號(hào)：1903662