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Influence of hot-rolling on the microstructure and mechanical properties of a near β-type Ti-5.2Mo-4.8Al-2.5Zr-1.7Cr alloy

引用

Progress in Natural Science:Materials International 2022年第4期32卷 504-509页

作者： Xinjie Zhu Qunbo Fan Guxin Zhou Duoduo Wang Chinese Weapons Science Academy Ningbo Branch National Key Laboratory of Science and Technology on Materials Under Shock and Impact School of Materials Science and Engineering Beijing Institute of Technology

In this work, the 90° clock rolling and the uni-directionally rolling processes at high temperature were carried out on the near β-type Ti-5.2Mo-4.8Al-2.5Zr-1.7Cr titanium alloy cutting from an ingot, respectively. The corresponding microstructures were quantitatively characterized, and its effect on the dynamic mechanical properties and fracture mechanism were emphatically investigated. It was found that after 90° clock rolling, the microstructure composed of equiaxed primary α phase(αp) with an average size of about 2 μm and the β transformed regions containing the acicular secondary α phase(αs) with an average thickness of about 50 nm and the separated β phase was obtained. However, in the uni-directionally rolled titanium alloy, no acicular αswas observed, and the corresponding microstructure consisted elongated lamellar α phase(average thickness: about 1.3 μm), few equiaxed α phase(average grain size: about 300 nm) and the inlaid β phase. The microstructural difference of the hot-rolled titanium alloys was closely related to the deformation process. Moreover, a great number of αpand αsin the 90° clock rolled titanium alloy effectively enhanced the strength, and the dynamic compressive strength reached to 1730 MPa. Furthermore, equiaxed αpwas conducive to the homogeneous deformation, which counteracted the localized deformation caused by acicular αsto a certain extent and made the 90°clock rolled titanium alloy exhibit an acceptable critical fracture strain of about 10.5%. Moreover, the fracture microstructures showed that the main failure mode of the 90°clock rolled and the uni-directionally rolled titanium alloy were ductile fracture and brittle fracture, respectively.

关键词： 90° clock rolling Microstructure Mechanical properties Titanium alloy

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