Transactions of Materials and Heat Treatment

Title：Microstructure and mechanical properties of Mg alloy surface composite  layer fabricated by friction stir processing

Authors： Li Tianqi1 Yan Yuanyuan1 Xie Hui1 Tang Jianjiang1 Wu Kunyao1 Zhang Jinlong1 Qiao Ke2 3

Unit： 1.School of Materials Engineering Xi′an Aeronautical University Xi′an 710077 China 2.College of Metallurging Engineering Xi′an University of Architecture and Technology Xi′an 710055 China 3. State Local Joint Engineering Research Center for Functional Materials Processing Xi′an University of Architecture and Technology Xi′an 710055 China

KeyWords： friction stir processing processing pass AZ31 magnesium alloy C60 particles grain refinement

ClassificationCode：TG457.1

year,vol(issue):pagenumber：2019,44(5):162-168

Abstract：

Magnesium alloy surface composite was prepared by friction stir processing (FSP) with rolled AZ31 magnesium alloy as the matrix and C60 particles as the reinforcing phase. After 1-3 passes of FSP with rotation speed of 600 r·min-1 and traverse speed of 118 mm·min-1, respectively, the microstructure and mechanical properties of stir zone were characterized and analyzed by metallographic test, TEM test, microhardness test and tensile test. The results show that FSP can produce significant grain refinement. After C60 is added, with the increasing of pass number for 1 to 3 passes, the disperision degree of C60 increases, the average grain size of composites decreases, and the hardness and tensile strength increase. However, the agglomerated particles dispersed between grains make the tensile properties lower than that of the base metal. In the sample after adding C60, the hardness after two passes increases significantly, the highest hardness reaches 1.73 times of the base metal, and the average hardness after three passes is the highest. The results show that the magnesiumbased surface composite layer strengthening material can be prepared by FSP.

Funds：

陕西省教育厅科学研究项目（18JK0409）

作者简介：李天麒（1992-），男，硕士，助教 Email：litianqi@xaau.edu.cn

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