(1. 沈陽航空航天大學(xué) 材料科學(xué)與工程學(xué)院，沈陽 110136；
2. 齊魯工業(yè)大學(xué)(山東省科學(xué)院)新材料研究所 山東省輕質(zhì)高強(qiáng)金屬材料重點(diǎn)實(shí)驗(yàn)室，濟(jì)南 250014)
摘 要: 以AZ系鎂合金(AZ31、AZ80和AZ91)中的Al-Mn相作為研究對(duì)象，利用OM、SEM和EPMA等方法研究Al-Mn相在AZ系鎂合金中的分布和形成，討論Al-Mn相在晶內(nèi)、晶界及氧化物夾雜處的組成，及Al-Mn相在氧化物夾雜處析出機(jī)理。結(jié)果表明：AZ系鎂合金中的Al-Mn相主要為顆粒狀、棒狀和不規(guī)則塊狀，尺寸均小于30 μm，主要分布在初生α-Mg、β-Mgl7Al12相和晶界處，呈彌散分布形態(tài)； Al-Mn相為Al8Mn5或Al8(Mn,Fe)5。AZ系合金中的氧化物夾雜MgO能夠誘發(fā)Al8Mn5相在其周圍以聚集分布的形式析出；通過分析Al8Mn5相在MgO夾雜處形成、富集機(jī)理，獲得Al8Mn5相在AZ系鎂合金中MgO夾雜處形核長(zhǎng)大的析出模式。
關(guān)鍵字: AZ系鎂合金；Al-Mn相；氧化物夾雜；分布；形成機(jī)理
（1. School of Material Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China;
2. Shandong Key Laboratory for High Strength Lightweight Metallic Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Ji’nan 250014, China）
Abstract:The distribution and formation of Al-Mn phase in AZ series magnesium alloys (AZ31, AZ80, and AZ91) were investigated by OM, SEM and EPMA. The composition of Al-Mn phase on grains, grain boundary and oxide inclusions, as well as the precipitation mechanism of Al-Mn phase on the oxide inclusions was discussed. The results show that the Al-Mn phases in AZ system magnesium alloys are mainly granular, rod-like and irregular block, with size of less than 30 μm. Al8Mn5 or Al8(Mn,Fe)5 are dispersed on the primary α-Mg, β-Mgl7Al12 phase and grain boundary. The entrained MgO in AZ series alloys can induce the precipitation of Al8Mn5 particles which cluster around MgO. The mechanism of formation and enrichment of Al8Mn5 on MgO is analyzed, and the precipitation modes of nucleation and growth of Al8Mn5 phase on MgO in the AZ series magnesium alloys are obtained.
Key words: AZ Series magnesium alloys; Al-Mn phase; oxide inclusion; distribution; formation
