多层喷射沉积6066铝合金半固态挤压

来源期刊：中国有色金属学报1998年第2期

论文作者：张豪 陈振华 康智涛 周多三

文章页码：191 - 196

关键词：喷射沉积 半固态 铝合金

Key words：spray deposition , semi-solid aluminum alloy , near-net-shaping , microstructure

摘    要：采用多层喷射沉积技术制备6066铝合金(Al-1.37Si-1.37Mn0.77Cu)锭坯，研究了后续半固态挤压工艺的可行性，及其对材料组织与性能的影响。结果表明, 多层射喷沉积6066铝合金的平均晶粒度约为15μm，呈等轴晶；在固相线以下退火40min后， 组织无明显粗化， 在半固态发生的晶粒长大符合Ostwald晶粒粗化动力学方程， 半固态典型组织为球形或近球形的固体颗粒分布于液相中，为适宜于半固态加工的搅溶组织。 半固态挤压成形力约为传统热挤压的1／3， 挤压件具有良好的第二相粒子分布状态， 在T6热处理过程中组织发生再结晶， 晶粒明显细化，二相粒子平均粒度由热挤压态的1μm增至2μm， 体积分数有所增加，材料力学性能达到传统热挤压件水平。

Abstract: 6066 aluminum alloy billets(Al-1.37Si-1.37Mg-0. 77Cu) were produced by multi-layer spray deposition technology, studies were carried out to evaluate the feasibility of subsequent semi-solid extrusion and its influence on microstructure and mechanical properties. As-sprayed grain was equiaxed with mean size of about 15μm, grains coarsened slightly in full solid state, which are in good agreement with Ostwald coarsing mechanism. Typical microstructures of as-sprayed materials heated to semi-solid state are of spheriodical solid particles distributed in liquid phase, which are thixotropic microst ructure fit to thixoforming. The necessary extrusion force in semi-solid state is about 1/3 of that in coventional hot extrusion. As-extruded materials have uniform precipitates distribution and achieve finer recrystallization grains under T6 condition. Mean precipitated size increase from 1μm to 2μm after T6 treatment, and mechanical properties reach that of conventional hot extruded materials.