Features of Duplex Microstructural Evolution and Mechanical Behavior in the Titanium Alloy Processed by Equal-Channel Angular Pressing

被引：9

作者：

Semenova, Irina P. ^{[1
]}

Dyakonov, Grigory S. ^{[1
]}

Raab, Georgy I. ^{[1
]}

Grishina, Yulia F. ^{[1
]}

Huang, Yi ^{[2
]}

Langdon, Terence G. ^{[2
]}

机构：

[1] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, 12 K Marx Str, Ufa 450008, Russia

[2] Univ Southampton, Fac Engn & Environm, Mat Res Grp, Southampton SO17 1BJ, Hants, England

来源：

ADVANCED ENGINEERING MATERIALS | 2018年 / 20卷 / 08期

基金：

欧洲研究理事会;

关键词：

Duplex structure; Grain refinement; Mechanical properties; Recrystallization; Ti alloy; SEVERE PLASTIC-DEFORMATION; TI-6AL-4V ALLOY; HOT-WORKING; TEMPERATURE; FLOW;

D O I：

10.1002/adem.201700813

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This report describes a study of the regularities in the kinetics of microstructure evolution and recrystallization processes in the Ti-5.7Al-3.8Mo-1.2Zr-1.3Sn alloy (Russian analogue VT8M-1) during processing by equal-channel angular pressing (ECAP). To produce a duplex (globular-lamellar) structure, the billets are subjected to preliminary heat treatment, including water-quenching from a temperature below the -transus followed by annealing at 700 degrees C. For the ECAP temperature selection, the deformation behavior of the alloy with a duplex structure is investigated under upsetting in the temperature range of 650-800 degrees C. The evolution of the globular and lamellar fractions is examined during ECAP processing, and an emphasis is placed on the role of phase transformations, dynamic recrystallization, and spheroidization of the -phase which is realized with increasing accumulated strain when processing by ECAP. It is demonstrated that after 6 ECAP passes an equiaxed ultrafine-grained structure is formed with a mean -phase grain/subgrain size of approximate to 0.6m. The investigation includes an examination of the effect of microstructure on the mechanical properties of the alloy.

引用

页数：11

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