(哈尔滨工业大学材料学院，哈尔滨150001)
摘 要: 采用新型的喷射沉积快速凝固工艺制备了Al-3.8Lr-0.8Mg-0.4Cu-0.13Zr合金，并对合金的显微组织与拉伸性能进行了实验研究。实验结果表明，沉积态合金组织为细小、均匀的等轴晶，晶粒尺寸大多在5~20μm范围内。经热挤压后合金组织中的晶粒呈“砖块”状或“竹节”状形貌特征，晶界上破碎的氧化物很少。时效析出不规则形状的δ相粒子和球壳状β-δ复合沉淀相。δ粒子的粗化速度较快，δ粒子间距随时间增大的趋势不明显。喷射沉积Al-Li合金短时间时效(190℃，10 h)即可达到峰时效状态，此时材料的综合性能最优(σb= 534 M Pa，σ0.2= 480 M Pa，延伸率为10% )。与粉末冶金Al-Li合金相比材料的塑性明显改善而强度相当。
关键字: 喷射沉积 快速凝固 Al-Li合金 显微组织 拉伸性能
RAPIDLY SOLIDIFIED Al-3.8Li-0.8Mg-0.4Cu-0.13Zr
ALLOY BY SPRAY DEPOSITION PROCESS
（School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001）
Abstract:Al-3.8Li-0.8Mg-0.4Cu-0.13Zr alloy was produced by a novel spray deposition process, and its microstructure and tensile properties in various aging conditions have been investigated. The experimental results showed that, the as-deposited material is composed of very fine equiaxed grains with the size of 5~20μm; grains in the as-extruded alloy is“brick-like”in morphology, and no oxide particles are found at the grain bounderies;δ′particles with irregular
shape and“δ′-β′”co-precipitates precipitate in the aged alloy. The coarsening rate ofδ′particles is fast, and the distance between the particles doesn t widen obviously as that of IM alloys with the aging time. The spray deposited Al-Li alloy gets to the peak age condition in a short time(190℃, 10 h) and obtains the best properties(σb=534 MPa,σ0.2=480 MPa,δ=10%). Compared with RSPM Al-Li alloy, ductility of the tested alloy is improved obviously while comparable tensile strength is maintained.
Key words:spray deposition rapid solidification Al-Li alloy microstructure tensile property
Key words: spray deposition rapid solidification Al-Li alloy microstructure tensile property
