首页|Effect of Al2O3 fiber on twin intersections-induced dynamic recrystallization in fine-grained TiAl matrix composite

Effect of Al2O3 fiber on twin intersections-induced dynamic recrystallization in fine-grained TiAl matrix composite

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Dynamic recrystallization(DRX)is of great significance for the thermomechanical processing and mi-crostructural regulation of TiAl intermetallics.However,the underlying DRX mechanism remains poorly understood.In this study,an Avrami kinetics model for DRX was established,which was capable of pre-dicting the DRX fraction accurately.In addition,the effect of Al2O3 short fiber on the DRX mechanisms of TiAl matrix composite during the isothermal compression was investigated for the first time.The re-sults showed that other than inhibiting DRX by particles in the TiAl matrix composites,the addition of Al2O3 short fiber accelerated a novel DRX process,which was induced by twinning and twin intersec-tions(TDRX).Thus,this composite exhibited a higher DRX rate than that of the as-cast TiAl monolithic alloy.The origin of the twin intersection and TDRX for the composite was revealed.The stress concentra-tion near the Al2O3 fiber was above the critical shear stress for twinning and thus was favorable for the formation of twinning and twin intersections.The high stored strain energy at the regions of twins and twin intersections provided the driving force for TDRX.TDRX accelerated the grain refinement in the TiAl matrix near the Al2O3 fiber.The present findings would provide a new perspective on DRX mechanisms,and provide the scientific guidance for optimizing the microstructures of TiAl matrix composites.

TiAl matrix compositeAl2O3 fiberTwin intersectionDynamic recrystallization

Yaofeng Luo、Yan Wang、Li Wang、Bin Liu、Yong Liu

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State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China

National Science and Technology Major ProjectNatural science Foundation of Hunan ProvinceCentral South University Innovation-Driven Research ProgrammmeIndependent Innovation Fund Project Aero Engine Corporation of ChinaPostgraduate Scientific Research Innovation Project of Hunan ProvinceFundamental Research Funds for the Central Universities of Central South University

20197001601572021JJ40761v2023CXQD030CXPT-2021-001CX202301632023ZZTS0078

2024

10.1016/j.jmst.2023.07.013

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.172(5)
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