基于超声纳米表面改性的镁锂合金强化研究

Strengthening Research of Mg-Li Alloy Based on Ultrasonic Nanocrystal Surface Modification

为了得到超声纳米表面改性(UNSM)技术的工艺参数(静压力、移动速度和间距)对LA106镁锂合金表面性能指标(硬度、粗糙度和硬化层深度)的影响程度,采用显微硬度计和三维表面形貌测量系统分别测试LA106镁锂合金经UNSM处理后的显微硬度值和表面粗糙度;并结合显著性方法分析正交试验结果,利用多目标优化设计方法研究了不同UNSM工艺参数下的综合强化效果。结果表明:UNSM工艺参数对LA106镁锂合金综合强化效果影响程度由大到小的顺序为静压力、间距、移动速度;经过多目标优化设计,通过直观分析得到了UNSM处理LA106镁锂合金工艺参数的最佳组合:静压力0.3 MPa,移动速度1500 mm/min,间距0.05 mm,利用UNSM技术强化LA106镁锂合金时,主要应考虑静压力的影响。

To obtain the influence of process parameters(static pressure,scanning speed and feed)of ultrasonic nanocrystal surface modification(UNSM)technology on the surface performance indexes(microhardness,surface roughness and depth of hardening layer)of LA106 magnesium-lithium(Mg-Li)alloy,the microhardness tester and the three-dimensional surface topography measurement system were utilized to test the microhardness and surface roughness of LA106 Mg-Li alloy after UNSM treatments.Combined with the saliency method,the orthogonal experimental results were analyzed,and the multi-objective optimization design method was used to study the comprehensive enhancement effect under the different UNSM process parameters.The results showed that the order of UNSM process on the comprehensive enhancement effect of LA106 Mg-Li alloy was as follows:static pressure,feed,and scanning speed.After multi-objective optimization design,the optimal combination of UNSM process parameters of LA106 Mg-Li alloy was obtained through intuitive analysis:static pressure of 0.3 MPa,scanning speed of 1500 mm/min and feed of 0.05 mm.Therefore,the effect of static pressure should be mainly considered when UNSM technology was utilized to strengthen LA106 Mg-Li alloy.