Fine colonies promote twinning-induced large plasticity in cast Ti-64 alloy

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters Pub Date : 2025-03-31 DOI:10.1016/j.matlet.2025.138511

Yuqing Song, Hongchao Kou, Guodong Wang, Mingxiang Zhu, Dian Jiao, Sisi Xie, Jinhong Guo

引用次数: 0

Abstract

Ti-6Al-4 V (Ti-64) alloy specimens were prepared using two distinct casting methods, gravity casting and centrifugal casting. The room-temperature tensile results demonstrate that the strength of the alloys prepared by the two casting methods is comparable, but the plasticity of the latter (16 %) is twice as great as that of the former (8 %). Microstructural analysis reveals that the α colony size within the centrifugally casting alloy was smaller, which promoting the formation of {10–12} < -1011 > tensile twins. It in turn favors the plasticity of casting Ti-64 alloy. Basal dislocations are generated within the twin, which decompose at the interface at the tip of the twin causing the interface to shift forward. This is not only indicative of the twin’s role in coordinating deformation but also serves as a mechanism for the further growth of the twin.

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细小的菌落促进了铸态Ti-64合金的孪晶大塑性

采用重力铸造和离心铸造两种不同的方法制备了ti - 6al - 4v （Ti-64）合金试样。室温拉伸结果表明，两种铸造方法制备的合金强度相当，但后者的塑性（16%）是前者（8%）的两倍。显微组织分析表明，离心铸造合金内部α集落尺寸较小，促进了{10-12}<的形成；-1011比;拉伸双胞胎。这反过来又有利于铸造Ti-64合金的塑性。孪晶内部产生基位错，基位错在孪晶尖端的界面处分解，导致界面前移。这不仅表明了双生体在协调变形中的作用，而且还作为双生体进一步生长的机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive