The effect of cooling rates on the microstructure and mechanical properties of thermo-mechanically processed Ti-Al-Mo-V-Cr-Fe alloys

被引：53

作者：

Ahmed, Mansur ^{[1
]}

Savvakin, Dmytro G. ^{[2
]}

Ivasishin, Orest M. ^{[2
]}

Pereloma, Elena V. ^{[1
,3
]}

机构：

[1] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia

[2] Natl Acad Sci Ukraine, Inst Met Phys, UA-03142 Kiev, Ukraine

[3] Univ Wollongong, Elect Microscopy Ctr, Wollongong, NSW 2519, Australia

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 576卷

关键词：

Ti alloys; Cooling rate; X-ray diffraction; Microstructure; Mechanical properties; BETA-TITANIUM-ALLOYS; PROFILE ANALYSIS; HIGH-STRENGTH; POWDER-METALLURGY; ELASTIC-MODULI; TENSILE; STRAIN; DEFORMATION; BEHAVIOR; SIZE;

D O I：

10.1016/j.msea.2013.03.083

中图分类号：

TB3 [工程材料学];

学科分类号：

082905 [生物质能源与材料];

摘要：

Two near-beta titanium alloys, Ti-5Al-5Mo-5V-1Cr-1Fe and a modified one containing 2 wt% Cr (Ti-5Al-5Mo-5V-2Cr-1Fe) were produced from Ti hydride precursor powders via the cost-effective blended elemental powder metallurgy technique. The effects of two cooling rates (10 K s(-1) and 1 K s(-1)) during thermo-mechanical processing on the microstructure and mechanical properties were investigated using X-ray diffraction and scanning electron microscopy. X-ray line profile analysis revealed that dislocation densities and microstrain in beta-Ti phase are higher than in alpha-Ti phase for all cases. In both alloys, slower cooling results in an increase in alpha volume fraction and promotes morphology of continuous grain boundary alpha phase. A lower total elongation is obtained in both alloys under slower cooling which could be accounted for by the continuous morphology of alpha phase. Overall, Ti-5Al-5Mo-5V-1Cr-1Fe displays higher ultimate tensile strength and total elongation compared to Ti-5Al-5Mo-5V-2Cr-1Fe, regardless of the cooling rate. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：167 / 177

页数：11

共 72 条

[1]

Microstructure evolution and alloying elements distribution between the phases in powder near-β titanium alloys during thermo-mechanical processing [J].