微量Mn添加對(duì)Mg-6Zn-3Al鎂合金非枝晶組織演變的影響

微量Mn添加對(duì)Mg-6Zn-3Al鎂合金非枝晶組織演變的影響Effect of minor Mn addition on non-dendritic microstructure evolution of Mg-6Zn-3Al magnesium alloy

利用光鏡(OM)、掃描電鏡(SEM)、X射線衍射儀(XRD)研究了Mg-6Zn-3Al-xMn(x%=0%, 0.1%, 0.3%, 0.5%，質(zhì)量分?jǐn)?shù))合金的鑄態(tài)組織和在等溫?zé)崽幚磉^(guò)程中的非枝晶組織演變規(guī)律。結(jié)果表明：鑄態(tài)基體合金由α-Mg、Mg2Zn3、Mg7Zn3和Mg32(Al, Zn)49)相組成。添加Mn后，析出了AlMn和Al8Mn5相，且隨Mn含量的增加，晶粒逐漸得到細(xì)化。合金經(jīng)580 ℃等溫保溫30 min后，獲得的非枝晶組織由初生α1-Mg顆粒和包裹在共晶組織中二次水淬凝固形成的α2-Mg顆粒及分布在初生顆粒間呈蜂窩狀的共晶相組成。隨著Mn含量增加，固相顆粒的平均尺寸和形狀因子呈先減小后增加的趨勢(shì)，組織中液相比例逐漸減少。當(dāng)Mn含量(質(zhì)量分?jǐn)?shù))為0.1%時(shí)，可獲得近似球狀、細(xì)小圓整、均勻分布的固相顆粒。在等溫?zé)崽幚磉^(guò)程中，溶質(zhì)擴(kuò)散和界面張力對(duì)組織演變起主導(dǎo)作用。Zn和Al溶質(zhì)原子在液相中的成分起伏是初生顆粒在分離和球化過(guò)程中產(chǎn)生頸縮的重要原因。

The as-cast microstructure and non-dendritic microstructure evolution of Mg-6Zn-3Al alloys with varied Mn content (0%, 0.1%, 0.3% and 0.5%, in mass fraction) under isothermal heat treatment process were investigated with an OM, SEM and XRD, respectively. The results indicate that the as-cast Mn-free alloy is composed of α-Mg, Mg2Zn3, Mg7Zn3 and Mg32(Al, Zn)49 phases. When the minor Mn is added to the based alloy after, resulting in the creation of AlMn and Al8Mn5 phases, meanwhile, the grains are gradually refined with the Mn content increasing. The alloys are isothermally treated at 580 ℃ for 30 min, the obtained non-dendritic microstructures are comprised of primary α1-Mg particles and α2-Mg particles existed in eutectic microstructures which form in secondary quenching solidification process as well as eutectic phases with alveolate morphologies distributed between the primary solid particles. With the increase of Mn content, the average size and shape factor of solid phase particles decrease first and then increase, the volume fraction of liquid phase decreases continuously. When the content of Mn is 0.1%, the similarly spherical, finer and roundness as well as uniform distribution solid phase particles are obtained. The solute diffusion and interfacial tension play a leading role in the microstructural evolution during isothermal heat treatment. The component fluctuation of Zn and Al solute atoms in liquid phase is an important reason for the generation of necking in the process of separation and spheroidization of primary particles.

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