(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. 蘇州大學(xué) 沙鋼鋼鐵學(xué)院，蘇州 215006)
摘 要: 采用光學(xué)顯微鏡(OM)、掃描電子顯微鏡(SEM)、電子背散射衍射技術(shù)(EBSD)、透射電子顯微鏡(TEM)等分析預(yù)置粒子對ZM6鎂合金熱壓縮過程中顯微結(jié)構(gòu)的影響，并在室溫下進(jìn)行室溫力學(xué)性能測試。結(jié)果表明：預(yù)置粒子能夠有效促進(jìn)熱變形過程中的動態(tài)再結(jié)晶行為，熱壓縮后合金組織細(xì)化、織構(gòu)弱化，抗拉強(qiáng)度和伸長率都顯著提升。和固溶態(tài)樣品相比，預(yù)置粒子樣品在510 ℃下再結(jié)晶體積分?jǐn)?shù)由85%提升至100%，在不損害強(qiáng)度的前提下，伸長率提升至18.2%，提升了30%。
關(guān)鍵字: ZM6鎂合金；預(yù)置粒子；熱壓縮；動態(tài)再結(jié)晶；力學(xué)性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. School of Iron and Steel, Soochow University, Suzhou 215100, China）
Abstract:The effects of pre-existing particles on the microstructure of a ZM6 magnesium alloy during hot deformation were investigated by optical microscopy (OM), scanning electron microscopy (SEM), back-scattering diffractometry (EBSD), and transmission electron microscopy (TEM). The mechanical properties were detected through tensile tests at room temperature. The results show that dynamic recrystallization (DRX) is remarkably promoted during compression by the pre-existing particles. Accordingly, obvious grain refinement and basal texture weakening are observed after compression, resulting in improvement of ultimate tensile strength and elongation. Compared with the sample without pre-existing particles, the volume fraction of dynamic recrystallization increases from 85% to almost 100%, and the elongation of compressed sample with pre-existing particle treatment increases by 30%, reaching a maximum of 18.2%, without any drop in strength.
Key words: ZM6 Mg alloy; pre-exiting particle; hot compression; dynamic recrystallization; mechanical properties
