热输入对AZ31镁合金FSP试样力学性能的影响

发布时间：2018-02-19 23:41

本文关键词： 搅拌摩擦加工垫板 AZ镁合金晶粒细化显微硬度　出处：《航空材料学报》2015年01期 　论文类型：期刊论文

【摘要】：分别利用普通钢制垫板和自制的带有冷水通道的铜制垫板,对AZ31镁合金进行了搅拌摩擦加工。利用光学显微镜(OM)、SEM、显微硬度仪和拉伸设备,研究了被加工件厚度、搅拌头焊接速率和冷却条件对试样搅拌区力学性能的影响。研究表明:试样搅拌区从上层至中层和底层,再结晶晶粒尺寸依次减小。通过减小被加工件厚度、增大搅拌头焊接速率和加快冷却速率等方法,抑制了试样搅拌区晶粒长大。在搅拌头转速和焊接速率分别为800r/min和90mm/min的条件下,得到的搅拌区底部平均晶粒尺寸约为450nm,该区域显微硬度为96HV,与普通钢制垫板制备的试样相比,硬度提高了24HV,其屈服强度、抗拉强度和伸长率分别提高为原材料的1.27倍、1.6倍和2.2倍。
[Abstract]:The use of ordinary steel plate are respectively provided with a cold water channel and self-made copper plate for AZ31 magnesium alloy by friction stir processing. By using optical microscope (OM), SEM, micro hardness and tensile device, on the workpiece thickness, the influence of welding speed and cooling conditions on the mechanical properties of specimen mixing zone of the mixing head research shows: the sample area from the upper to middle and bottom stirring, the recrystallization grain size decreases gradually. By reducing the workpiece thickness, increase the stirring head welding speed and speed up the cooling rate, the grain growth inhibition zone. Sample mixing in the mixing head speed and welding speed were 800r/min and 90mm/min conditions. The mixing area at the bottom of the average grain size is about 450nm, the micro hardness of 96HV, compared with ordinary steel plate specimen preparation, hardness increased 24HV, the yield strength, tensile strength And the elongation is 1.27 times, 1.6 times and 2.2 times of the raw material, respectively.

【作者单位】：西京学院机械工程学院;南京航空航天大学机电学院;承德石油高等专科学校工业中心;
【基金】：陕西省教育厅科研基金项目资助(11JK0880)
【分类号】：TG146.22

【共引文献】