CAJ | 학술논문

利用多功能雾化沉积装置,制备了Ni3Al-Mo高温合金.拉伸性能测试表明:喷射沉积Ni3Al-Mo合金的屈服强度有明显的"R"特性,即喷射沉积合金的屈服强度随着温度的增加而增加,在760 ℃时达到最大值;随着温度的继续增加,屈服强度会逐渐降低.利用TEM对位错结构分析,阐明了合金屈服强度与微观结构之间的关系.研究结果表明,试验合金所具有的屈服强度随温度的变化规律主要是由不同温度下γ′及γ相内的位错缠结状况、位错对的形态及数量和六面体滑移系的开动程度决定的.裂纹的TEM分析表明,随着变形应力的增加,裂纹在晶界部位产生,然后迅速扩展,而且在不同的晶面内存在一些不同的滑移带.喷射沉积合金在室温、中温及高温下裂纹严格沿八面体滑移系(111)面开裂.
이용다공능무화침적장치,제비료Ni3Al-Mo고온합금.랍신성능측시표명:분사침적Ni3Al-Mo합금적굴복강도유명현적"R"특성,즉분사침적합금적굴복강도수착온도적증가이증가,재760 ℃시체도최대치;수착온도적계속증가,굴복강도회축점강저.이용TEM대위착결구분석,천명료합금굴복강도여미관결구지간적관계.연구결과표명,시험합금소구유적굴복강도수온도적변화규률주요시유불동온도하γ′급γ상내적위착전결상황、위착대적형태급수량화륙면체활이계적개동정도결정적.렬문적TEM분석표명,수착변형응력적증가,렬문재정계부위산생,연후신속확전,이차재불동적정면내존재일사불동적활이대.분사침적합금재실온、중온급고온하렬문엄격연팔면체활이계(111)면개렬.
A Ni3Al-Mo intermetallic compound alloy (IC6) was prepared by using the multifunctional spray atomization and deposition plant. Tensile properties tests indicate that the spray deposited Ni3Al-Mo alloy possesses "R" characteristics in the yield strength, that is, the yield strength of the spray deposited IC6 increases with increasing of temperature and it reaches maximum around 760 ℃. After that, they decrease with increasing of temperature. Analyses of dislocation structure by TEM reveal the relationship between the microstructure and yield strength. The results show that the change of the yield strength of the alloy with temperature is associated with the condition of dislocation winding, pattern and quantity of the dislocation pairs and starting degree of the hexahedron slip system inside γ′ and γ phases. The analysis of cracking by stereographic projection shows that with the increase of deformation stress the cracks form at grain boundaries and then quickly propagate, and some different slip bands exist in little planar zones; no matter at room temperature, middle temperature or high temperature, cracks craze along (111) plane octahedron slip.