激光粉末床熔敷WE43非均晶合金的变形与断裂机制

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Chen Ji , Liang Zhu , Bangzhao Yin , Shengwen Bai , Lawrence E. Murr , Peng Wen , Bin Jiang , Fusheng Pan , Kun Li
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引用次数: 0

摘要

激光粉末床熔融(LPBF)作为一种新兴的先进金属制造技术,通过其独特的非平衡凝固效应改变了镁合金的微观组织特征,从而影响了镁合金的力学响应,特别是在高温下的力学响应。在此背景下,本研究表征了激光粉末床熔合(LPBFed) WE43合金的显微组织和温度相关的准静态拉伸行为。LPBF固有的重熔和热循环过程导致原位析出β′、β1和β相,并形成双峰型晶粒结构,具有独特的高温力学性能。高温拉伸试验表明,LPBFed WE43合金在200~250℃时仍保持较好的强度,但在300℃时强度明显下降。此外,LPBFed WE43合金在250°C时表现出反常的伸长率。利用EBSD技术系统地进一步揭示了LPBFed WE43合金独特的变形机理。结果表明:在200~300℃高温拉伸试验中,原位弥散析出相的存在作为再结晶的成核部位,导致再结晶成为LPBFed WE43合金的主要变形方式;同时,这些分散相的存在也限制了孪晶的形成。在此过程中,不连续动态再结晶(DDRX)和连续动态再结晶(CDRX)同时发生,随着温度的升高,DDRX占主导地位。此外,只有在250℃时才观察到明显的应力集中,这是导致异常伸长和锥体i <; C +a>;激活的原因。滑动。300℃时,细晶的晶界强度显著降低,晶界滑移(GBS)明显。GBS极大地缓解了应力集中,但也显著降低了强度。不同的变形机制最终导致LPBFed WE43合金的破坏行为不同。在200℃时,失效主要是由熔池边界元素偏析引起的微裂纹扩展引起的。在250°C的临界温度下,DRX行为和GBS的激活不足会产生“机械间隙”,导致氧化物附近的应变调节不合时宜。当温度达到300℃时,动态再结晶过程显著增强,裂纹扩展模式发生根本性转变,晶间裂纹成为主要破坏机制。本工作揭示了LPBFed WE43合金的温度依赖性变形和断裂行为,为其在高温环境中的应用提供了新的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Temperature-dependent mechanical behaviors of laser powder bed fused WE43 alloy with heterogeneous grain structure: Deformation and fracture mechanisms
Laser powder bed fusion (LPBF), as an emerging advanced metal manufacturing technology, alters the microstructural characteristics of Mg alloys through its unique non-equilibrium solidification effects, thereby influencing their mechanical responses, especially at high temperatures. In this context, this study characterizes the microstructure and temperature-dependent quasi-static tensile behavior of laser powder bed fused (LPBFed) WE43 alloy. The inherent remelting and thermal cycling processes of LPBF lead to the in-situ precipitation of β′, β1, and β phases, as well as the formation of a bimodal grain structure, resulting in unique high-temperature mechanical properties. High-temperature tensile tests show that the LPBFed WE43 alloy maintains good strength at 200–250°C, but its tensile strength significantly decreases at 300°C. Additionally, the LPBFed WE43 alloy exhibits anomalous elongation at 250°C. EBSD technology was used to systematically further reveal the unique deformation mechanisms of the LPBFed WE43 alloy. The results indicate that the presence of various dispersed in-situ precipitates, which act as nucleation sites for recrystallization, leads to recrystallization being the primary deformation mode of the LPBFed WE43 alloy during high-temperature tensile testing at 200–300°C. Simultaneously, the existence of these dispersed precipitates also restricts the formation of twins. During this process, both discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) occur simultaneously, with DDRX becoming dominant as the temperature increases. Moreover, significant stress concentration is observed only at 250°C, which is responsible for the anomalous elongation and the activation of pyramidal II<c+a> slip. At 300°C, the grain boundary strength of fine grains significantly decreases, leading to pronounced grain boundary sliding (GBS). GBS greatly alleviates stress concentration but also significantly reduces strength. Different deformation mechanisms ultimately lead to different failure behaviors of LPBFed WE43 alloy. At 200°C, failure predominantly originates from microcrack propagation induced by elemental segregation at melt pool boundaries. At this critical temperature of 250°C, the insufficient activation of DRX behavior and GBS creates a 'mechanistic gap', resulting in untimely strain accommodation near oxides. When the temperature reaches 300°C, a fundamental transition in crack propagation mode occurs due to significantly enhanced dynamic recrystallization processes, with intergranular cracking becoming the predominant failure mechanism. This work reveals the temperature-dependent deformation and fracture behaviors of the LPBFed WE43 alloy and provides new insights for its application in high-temperature environments.
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来源期刊
Journal of Alloys and Compounds
Journal of Alloys and Compounds 工程技术-材料科学:综合
CiteScore
11.10
自引率
14.50%
发文量
5146
审稿时长
67 days
期刊介绍: The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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