Evolution process of T1 precipitate in Al–Cu–Li–TiC/TiB2 alloy during aging treatment

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-12 DOI:10.1016/j.jmrt.2024.09.046
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Abstract

In this study, particle-reinforced aluminium matrix composites (PRAMCs) of an Al–Cu–Li alloy were prepared using nano-sized TiB₂+TiC particles. The relationship between TiB₂+TiC nanoparticles and T1 precipitates during the ageing process, as well as the influence of TiC + TiB₂ particles on the growth process of T1 precipitates during the ageing process, were investigated. The grain sizes of the A0 and A1 samples were found to be 249.89 μm and 86.42 μm, respectively. The dislocation density is greater in the deformed A1 sample. The coefficient of thermal expansion (CTE) effect generated by TiC and TiB₂ particles stimulates the precipitation process of T1 precipitates. The A1 alloy reached the peak ageing state in a shorter time and yielded a greater number of T1 precipitates. The precipitation process of T1 precipitate is: SSSS→T1P→T1. The transition from T1P (face-centered cubic, FCC) to T1 (hexagonal close packing, HCP) entails a modification in the order of packing. The recently formed T1P precipitate is attached to the established T1 precipitate and extends along the c-axis through the shared copper-rich layer that has formed on both sides of the mature T1 precipitate. The mechanical properties of sample A1 are optimal at T = 22h, with a yield strength, tensile strength, and elongation of 520 MPa, 553 MPa, and 8.2%, respectively. In comparison to the A0 sample, the yield strength and tensile strength exhibited an increase of 5.05% and 5.13%, respectively.

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时效处理过程中 Al-Cu-Li-TiC/TiB2 合金中 T1 沉淀的演变过程
本研究使用纳米尺寸的 TiB₂+TiC 颗粒制备了铝-铜-锂合金的颗粒增强铝基复合材料(PRAMC)。研究了 TiB₂+TiC 纳米颗粒与老化过程中 T1 沉淀物之间的关系,以及 TiC + TiB₂ 颗粒对老化过程中 T1 沉淀物生长过程的影响。结果发现,A0 和 A1 样品的晶粒大小分别为 249.89 μm 和 86.42 μm。变形 A1 样品的位错密度更大。TiC 和 TiB₂ 颗粒产生的热膨胀系数(CTE)效应刺激了 T1 沉淀的析出过程。A1 合金在更短的时间内达到峰值时效状态,并产生更多的 T1 沉淀。T1 沉淀的析出过程为SSSS→T1P→T1。从 T1P(面心立方,FCC)到 T1(六方紧密堆积,HCP)的转变需要改变堆积顺序。新形成的 T1P 沉淀附着在已形成的 T1 沉淀上,并通过在成熟的 T1 沉淀两侧形成的共享富铜层沿 c 轴延伸。样品 A1 的机械性能在 T = 22h 时达到最佳,屈服强度、抗拉强度和伸长率分别为 520 兆帕、553 兆帕和 8.2%。与 A0 样品相比,屈服强度和抗拉强度分别提高了 5.05% 和 5.13%。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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