Microstructure evolution and deformation behavior of laser-deposited TA15 alloy using in situ SEM study

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2025-01-03 DOI:10.1007/s10853-024-10491-0

Mahnoor Boukhari, Junxia Lu, Muhammad Rizwan, Xiaopeng Cheng, Mujahid Abbas, Qi Ren, Chan Guo

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Abstract

In this study an intricate examination, comparing various samples, has been conducted to elucidate the impact of post-heat treatments on both microstructural characteristics and mechanical properties undergoing deformation. The initial microstructure of Laser direct melting deposition (LDMD) TA15 is strategically tailored into a dual-phase arrangement of lamellar α and β phases through diverse thermal processing methods conducted both above and below the β‐transus temperature. It is crucial to analyze how their deformation behavior varies post-annealing. HT1 exhibited diminished strength and restricted plasticity before fracturing, contrasting with HT2 and HT3. HT2 displayed inferior strength yet superior plasticity pre-fracture compared to HT3. Conversely, HT3 showcased elevated strength yet less plasticity. Thermal treatment at 950 °C offers the desired amalgamation of strength and ductility. The analysis of fracture morphology revealed a direct correlation between the duration of heat treatment and the augmentation in both the size and depth of dimples accompanied by the necessary levels of ultimate tensile strength.

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激光沉积TA15合金组织演变及变形行为的原位SEM研究

在这项研究中，通过比较不同的样品，进行了复杂的检查，以阐明热处理后对变形时的微观组织特征和力学性能的影响。激光直接熔融沉积（LDMD） TA15的初始微观结构通过不同的热处理方法在β -横截面温度上下进行调整，形成片层α和β相的双相排列。分析其退火后变形行为的变化是至关重要的。与HT2和HT3相比，HT1在压裂前表现出强度降低和塑性受限。HT2的断裂前强度低于HT3，但塑性优于HT3。相反，HT3表现出较高的强度，但较低的塑性。在950°C下进行热处理，可以获得所需的强度和延展性。对断口形貌的分析表明，热处理时间与韧窝的尺寸和深度的增加以及所需的极限抗拉强度之间存在直接关联。

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.