预变形对 AZ80 合金沉淀行为的影响:滑移变形与孪晶主导变形的比较

IF 15.8 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Hyun Ji Kim , Sang Cheol Jin , Sumi Jo , Sung Hyuk Park
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引用次数: 0

摘要

本研究探讨了变形模式对挤压 Mg-8.0Al-0.5Zn-0.2Mn (AZ80) 合金析出行为的影响。对合金样品沿挤压方向施加 3.5% 的拉伸和 3.5% 的压缩分别诱发滑移主导变形模式和孪晶主导变形模式后进行比较。与预拉伸 (PT) 样品相比,含有大量{10-12}拉伸孪晶的预压缩 (PC) 样品的晶粒尺寸更小,内部应变更大,这归因于孪晶形成和生长过程中产生的固有内部应变。因此,PC 样品的析出行为加快,导致其峰值老化时间较短,仅为 32 小时,低于 PT 和挤压样品(分别为 48 小时和 100 小时)。此外,细小的连续析出物(CP)在{10-12}孪晶内迅速形成,从而提高了硬度。PC 样品中的不连续析出物(DP)硬度与含 CP 的孪晶区域相当,但由于{10-12}孪晶的生长抑制作用,PC 样品在老化过程中的粗化程度低于 PT 样品。最终,在孪晶主导变形条件下产生的{10-12}孪晶会增强沉淀行为,包括优先形成和细化 CP 以及抑制 DP 的粗化。因此,发生{10-12}孪晶的预变形比滑移诱导的预变形对析出加速和微结构改变的影响更为明显。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of pre-deformation on precipitation behavior of AZ80 alloy: Comparison of slip- and twinning-dominant deformation

Effect of pre-deformation on precipitation behavior of AZ80 alloy: Comparison of slip- and twinning-dominant deformation

Effect of pre-deformation on precipitation behavior of AZ80 alloy: Comparison of slip- and twinning-dominant deformation
This study investigates the effect of the deformation mode on the precipitation behavior of an extruded Mg–8.0Al–0.5Zn–0.2Mn (AZ80) alloy. The alloy samples are compared after the application of 3.5% tension and 3.5% compression along the extrusion direction to induce slip-dominant and twinning-dominant deformation modes, respectively. The pre-compressed (PC) sample, which contained numerous {10–12} tension twins, has a reduced grain size and a higher internal strain than the pre-tensioned (PT) sample, which is attributed to the inherent internal strain that occurs during the formation and growth of the twins. As a result, the precipitation behavior of the PC sample is accelerated, leading to its short peak aging time of 32 h, which is lower than those of the PT and as-extruded samples (48 and 100 h, respectively). Furthermore, fine continuous precipitates (CPs) rapidly form within the {10–12} twins, contributing to the enhanced hardness. Discontinuous precipitates (DPs), which have a hardness comparable to the CP-containing twinned regions, in the PC sample experience less coarsening during aging than those in the PT sample due to growth inhibition by the {10–12} twins. Ultimately, the {10–12} twins generated under the twinning-dominant deformation condition lead to enhanced precipitation behaviors, including the preferential formation and refinement of CPs and the suppressed coarsening of DPs. Consequently, pre-deformation that occurs {10–12} twinning exhibits more pronounced effects on precipitation acceleration and microstructural modification than slip-inducing pre-deformation.
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来源期刊
Journal of Magnesium and Alloys
Journal of Magnesium and Alloys Engineering-Mechanics of Materials
CiteScore
20.20
自引率
14.80%
发文量
52
审稿时长
59 days
期刊介绍: The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.
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