锻压技术

搅拌摩擦加工制备镁合金表面复合层的显微组织和力学性能

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

作者：李天麒闫原原谢辉唐健江吴坤尧张金龙乔柯

单位：1.西安航空学院材料工程学院陕西西安 710077 2.西安建筑科技大学冶金工程学院陕西西安 710055 3. 西安建筑科技大学功能材料加工国家地方联合工程研究中心陕西西安 710055

关键词：搅拌摩擦加工加工道次 AZ31镁合金 C60颗粒晶粒细化

分类号：TG457.1

出版年,卷(期):页码：2019,44(5):162-168

摘要：

选用轧态AZ31镁合金为基体、C60颗粒为增强相，采用搅拌摩擦加工技术（FSP）制备镁合金表面复合材料，搅拌针头旋转速度为600 r·min-1，加工速度为118 mm·min-1，分别进行1~3道次FSP加工后，通过金相、透射、硬度和拉伸等测试，对搅拌加工区复合显微组织和力学性能进行表征分析。研究表明：FSP可使镁合金晶粒显著细化；C60加入后，在1~3道次FSP内，随着加工道次升高，C60分散程度上升，复合材料平均晶粒尺寸降低，材料硬度上升，抗拉强度上升，但弥散于晶间的团聚颗粒使其拉伸性能低于母材；添加C60后的试样中，2道次硬度有明显上升，最高硬度可达母材的1.73倍，3道次试样硬度平均值最高。结果表明，可通过FSP制备镁基表面复合层强化材料。

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.

基金项目：

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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