(哈爾濱理工大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150040)
摘 要: 采用等通道轉(zhuǎn)角擠壓(ECAP)對(duì)MB15合金試樣進(jìn)行擠壓，利用有限元軟件DEFORM-3D進(jìn)行ECAP晶粒組織模擬，探索采用有限元模擬與實(shí)驗(yàn)分析相結(jié)合的方法，研究鎂合金ECAP成形過程的晶粒組織變化規(guī)律。模擬結(jié)果表明：數(shù)值模擬后試樣從頭部P1處、中部P2處到尾部P3處的晶粒組織細(xì)化程度明顯減小，平均晶粒尺寸從初始的13.32 μm減小到2.3~3.1 μm；采用ECAP方法進(jìn)行一道次擠壓，試樣的平均晶粒尺寸從13.32 μm減小到2.2 μm。對(duì)比數(shù)值模擬與實(shí)驗(yàn)分析結(jié)果表明：兩者在晶粒細(xì)化程度上吻合良好。
關(guān)鍵字: MB15合金；等通道轉(zhuǎn)角擠壓(ECAP)；晶粒細(xì)化；模擬
MB15 alloy prepared by equal-channel angular pressing
（School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China）
Abstract:The process of equal channel angular pressing (ECAP) was numerically simulated using a finite element software Deform-3D to study the improvement and advancement of plastic processing performance. The method of the combining application of finite element simulation and experimental analysis was explored to investigate the variation of grain structure during the ECAP forming process of Mg alloy. The results show that the grain size of the sample in different zones reduce remarkably, following the sequence of P1, P2 and P3. Its average grain size reduces to 2.3−3.1 μm from its former average size of 13.32 μm. The microstructures of the sample was observed by an metalloscope after the ECAP experiment within one pass. Its average grain size reduces from 13.32 μm to 2.2 μm. After comparing the results of finite element numerical simulation and the ones from experimental analysis, there is a good fit in grain refinement between the two.
Key words: MB15 alloy; equal-channel angular pressing (ECAP); grain refinement; simulation
