摘要
采用混合熔盐法制备xTiB_(2)/Al-5Cu-0.85Mn-0.35Mg-0.5Ag(x=0%,1%,3%,5%,质量分数,下同)复合材料,并进行单级时效和断续时效处理,研究不同热处理工艺对材料微观组织和力学性能的影响。结果表明:随着TiB_(2)含量的增加,复合材料的硬度和强度均呈持续增加趋势,但伸长率逐渐下降。当TiB_(2)含量为3%时,单级时效处理(175℃/3 h)后,复合材料的屈服强度、抗拉强度、弹性模量和伸长率分别为465.1,496.8 MPa,78.9 GPa和4.8%,采用175℃/1.5 h+150℃/13.5 h断续时效处理后,复合材料的屈服强度、抗拉强度和弹性模量分别提高至479.3,507.2 MPa和79.1 GPa,比单级时效处理分别提高了5.9%,2.1%和0.25%,伸长率下降至4.1%。二次时效温度显著影响时效沉淀相的析出序列,是材料性能得以大幅提高的主要原因,当二次时效温度为100℃时,θ'-Al_(2)Cu相为主要时效强化相,二次时效温度为150℃时,Ω-Al_(2)Cu相成为主要的时效强化相。
The xTiB_(2)/Al-5Cu-0.85Mn-0.35Mg-0.5Ag(x=0%,1%,3%,5%,mass fraction,the same below)composites are fabricated by a mixed salt reaction method,followed by single-stage and interrupted aging treatments.The effects of differing thermal processing regimes on the microstructural and mechanical properties of the materials are systematically studied.The results indicate that as the TiB_(2)content increases,both the hardness and strength of the composites show a continuous upward trend,while the elongation gradually decreases.When the TiB_(2)content is 3%,after single-stage aging treatment(175℃/3 h),the composite’s yield strength,tensile strength,elastic modulus,and elongation reach 465.1,496.8 MPa,78.9 GPa,and 4.8%,respectively.After undergoing an interrupted aging process at 175℃for 1.5 h followed by 150℃for 13.5 h,the yield strength,tensile strength,and elastic modulus of the composites increase to 479.3,507.2 MPa,and 79.1 GPa,respectively,representing increases of 5.9%,2.1%,and 0.25%compared to the single-stage aging treatment,with an elongation of 4.1%.The secondary aging temperature significantly affects the precipitation sequence of aging precipitates,which is the main reason for the substantial improvement in material properties.When the secondary aging temperature is 100℃,theθ'-Al_(2)Cu phase is the primary aging strengthening phase.At a secondary aging temperature of 150℃,theΩ-Al_(2)Cu phase becomes the main aging strengthening phase.
作者
王宇航
王培卿
李新雷
薛彦庆
张晗
吕亚东
WANG Yuhang;WANG Peiqing;LI Xinlei;XUE Yanqing;ZHANG Han;LYU Yadong(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China;The 46th Institute,the Sixth Academy of CASIC,Hohhot 010010,China;Xinjiang Zhonghe Co.,Ltd.,Urumqi 832099,China)
出处
《材料工程》
北大核心
2025年第2期186-194,共9页
Journal of Materials Engineering
基金
陕西省2024年重点研发计划项目(2024GX-YBXM-170)
陕西省2021年重点研发计划项目(2021ZDLGY14-07)
中国博士后科学基金(2024MD753996)。
