【摘要】 利用电子束物理气相沉积技术(EB-PVD)制备NiCrAl/Ni3Al微叠层复合材料,对其在制备态和时效态不同温度下的力学性能进行试验,考察不同时效温度对材料拉伸性能的影响。结果表明,制备态样品沿柱状晶晶界发生脆性断裂,而热处理态样品的断口具有典型的韧性断裂特征。力学性能测试结果表明,经过适当的热处理后,微层材料室温和高温力学性能与制备态时相比,有明显的改善。经740℃/32h热处理后,材料性能明显提高。更多还原

【Abstract】 NiCrAl/Ni3Al microlaminate composites were fabricated by electron beam physical vapor deposition(EB-PVD).The tensile tests for microlaminate samples under different temperature were performed on the as-deposited and aged state composites.The relationship of aging temperature and tensile properties for laminates was investigated.The results show that brittle rupture occurs along the intergranular of column crystals of as-deposited specimens,while the fractures of annealed specimens are tough fractures.Compared with those of condensates,mechanical properties of microlaminates at room and high temperatures are enhanced by heat-treating at 740℃ for 32h.更多还原