AZ31鎂基復(fù)合材料
(1. 大連理工大學(xué) 材料科學(xué)與工程學(xué)院 三束材料改性國家重點(diǎn)實(shí)驗(yàn)室，大連 116024；
2. 臺灣國立中山大學(xué) 材料科學(xué)研究所，臺灣高雄 804)
摘 要: 利用攪拌摩擦加工技術(shù)制備Ti顆粒含量為20%(體積分?jǐn)?shù)，下同)與40%的Mg-AZ31基復(fù)合材料。結(jié)果表明：碎化后的Ti顆粒平均尺寸約為200 nm，經(jīng)4次攪拌摩擦加工處理后基體組織發(fā)生明顯的細(xì)化，晶粒尺寸為3~5 μm。添加20% Ti顆粒的復(fù)合層中碎化的Ti顆粒在Mg基體中呈不均勻分布，復(fù)合層具有較低的強(qiáng)度和伸長率；當(dāng)Ti顆粒添加量為40%時(shí)，復(fù)合層中碎化Ti顆粒在Mg基體中均勻分布，復(fù)合層強(qiáng)度有明顯提高，伸長率較基體無明顯降低。利用混合定律計(jì)算復(fù)合層的顯微硬度，其結(jié)果與試驗(yàn)值相吻合。
關(guān)鍵字: 鎂合金；復(fù)合材料；攪拌摩擦加工；Ti顆粒
（1. State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams,
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China;
2. National Sun Yat-Sen University, Kaohsiung 804, China）
Abstract: Mg-AZ31 based composites with 20% (volume fraction) and 40% Ti particles were fabricated by friction stir processing (FSP). The results show that after four FSP passes the matrix structure of composite layers can be significantly refined within 3−5 μm obviously, and the fragments of the Ti particles are about 200 nm. The Ti fragments in the composite layer with 20% Ti particles have inhomogenous distribution and demonstrate poor tensile properties and low elongation. However, the Ti fragments in the composite layer with 40% Ti particles have homogenous distribution and the tensile properties of composite layer are greatly improved, and the elongation of composite layer has no obvious change compared with that of matrix. Using the rule of mixture to predict the microhardness values of composite layers, the results approximately match the experimental ones.
Key words: magnesium alloy; composites; friction stir processing (FSP); Ti particles
