(上海交通大學(xué) 材料科學(xué)與工程學(xué)院
金屬基復(fù)合材料國家重點(diǎn)實(shí)驗(yàn)室， 上海 200030)
摘 要: 采用含CeCl3的凈化熔劑對(duì)含Ce的鎂合金進(jìn)行精煉， 研究了CeCl3對(duì)合金中Ce損耗量的影響規(guī)律。 結(jié)果表明： 當(dāng)熔劑中不含CeCl3時(shí)，合金中的Ce損失高達(dá)27.7%； 而當(dāng)CeCl3的含量達(dá)到15%時(shí)， 合金中的Ce損失僅為4.5%， CeCl3處理使鎂合金中稀土相均勻分布，使Mg17Al12相細(xì)化， 但相組成沒有明顯變化； 隨著CeCl3含量的增加， 合金力學(xué)性能提高， 但過多的CeCl3會(huì)在合金中引入熔劑夾雜。并從熱力學(xué)方面探討了熔劑與鎂液的作用機(jī)理， 計(jì)算了鎂熔體中Mg和Ce的活度及熔劑熔體中MgCl2和CeCl3的活度。結(jié)果表明， 由于CeCl3抑制了合金中Ce與熔劑中MgCl2的反應(yīng)， 從而降低了Ce的損耗。
關(guān)鍵字: 鎂合金； Ce損耗； 精煉； 熱力學(xué)
Ce in magnesium alloy during refining
DING Wen-jiang, ZHU Yan-ping
（ State Key Laboratory of Metal Matrix Composites,
School of Materials Science and Engineering,
Shanghai Jiaotong University, Shanghai 200030, China）
Abstract: The effect of CeCl3 in flux on the loss of Ce in magnesium alloy during refining was investigated. The results show when there is no CeCl3 in the flux, the loss of Ce in the magnesium alloy AZ91 is 27.7%. When CeCl3 is added by 15% in the flux, the loss of Ce is only 4.5%, CeCl3 can also make Ce-containing phases distribute evenly and Mg17Al12 phase refine, but the phase composition of the experimental alloys can not change obviously. The mechanical properties of the alloys are improved by CeCl3 processing with the increase of CeCl2 content, and excessive CeCl3 will produce flux inclusions. Furthermore, the reactions between flux and magnesium melt were studied thermodynamically. The activities of Mg and Ce in magnesiun alloy and MgCl2 and CeCl3 in flux were calculated. The results show that CeCl3 restrains the reaction between Ce in magnesium alloy and MgCl2 in flux. Therefore, the loss of Ce in magnesium alloy decreases.
Key words: magnesium alloy; loss of Ce; refining; thermodynamic
