Deformation twinning feature and its effects on significant enhancement of tensile ductility in columnar-grained Fe–6.5wt.%Si alloy at intermediate temperatures

IF 5.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2012-04-01 Epub Date: 2012-01-03 DOI:10.1016/j.intermet.2011.12.011

Jianxin Xie , Huadong Fu , Zhihao Zhang , Yanbin Jiang

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引用次数: 46

Abstract

The tensile deformation behavior of columnar-grained Fe–6.5wt.%Si alloy with <100> fiber texture at intermediate temperatures (300–500 °C) was investigated. Compared with equiaxed-grained Fe–6.5wt.%Si alloy, the enhanced tensile ductility and its mechanism of columnar-grained Fe–6.5wt.%Si alloy were mainly studied by the analysis of tensile twinning Schmid factor value and the deformation microstructure. The results showed that tensile ductility of the Fe–6.5wt.%Si alloy with columnar grains were increased significantly, i.e., the elongation of the columnar-grained specimens were increased to 6.6% (300 °C), 51.1% (400 °C), 51.3% (500 °C), which, respectively, corresponded to an increase of 3.7%, 25.8% and 23.2% compared with that of the equiaxed-grained specimens. The analysis of tensile twinning Schmid factor value and the deformation microstructure both demonstrated that deformation twinning occurred locally in the equiaxed-grained Fe–6.5wt.%Si alloy, while a great number of twins formed homogeneously in the columnar-grained Fe–6.5wt.%Si alloy. The significant enhancement of tensile ductility of the columnar-grained Fe–6.5wt.%Si alloy at intermediate temperatures was mainly ascribed to the formation of a great number of homogeneous deformation twins.

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柱晶Fe-6.5wt变形孪晶特征及其对显著增强拉伸延展性的影响。中等温度下的%Si合金

柱晶Fe-6.5wt的拉伸变形行为。%Si合金<100>研究了纤维在中温(300-500℃)下的织构。与等轴晶Fe-6.5wt相比。在%Si合金中，柱状晶晶Fe-6.5wt的拉伸延展性增强及其机理。对%Si合金进行了拉伸孪晶施密德因子值分析和变形显微组织分析。结果表明，Fe-6.5wt的拉伸延展性较好。柱状晶%Si合金的伸长率显著提高，柱状晶试样的伸长率分别达到6.6%(300℃)、51.1%(400℃)和51.3%(500℃)，分别比等轴晶试样提高3.7%、25.8%和23.2%。拉伸孪晶施密德因子值和变形显微组织分析均表明，等轴晶Fe-6.5wt发生局部变形孪晶。在柱状晶晶Fe-6.5wt合金中，大量孪晶均匀形成。% Si合金。柱状晶粒Fe-6.5wt的拉伸延展性显著增强。%Si合金在中等温度下主要是形成了大量的均匀变形孪晶。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.