Microstructure and mechanical properties of CT1400 cryogenic titanium alloy

Microstructure and mechanical properties of CT1400 cryogenic titanium alloy

In urgent demand for high-performance cryogenic titanium alloy for the heavy-lift launch vehicle， a novel 1500 MPa Ti-Al-V-Zr-Mo-Nb cryogenic titanium alloy （CT1400） was designed. Alloy bars and powder metallurgy materials of CT1400 were fabricated， and the microstructure， tensile properties， and cr...

Full description

Saved in:
Bibliographic Details
Main Authors: ZHENG Zhuangzhuang, LU Zichuan, YANG Jianhui, CHANG Ruohan, TU Gang, YAO Caogen, LYU Hongjun, KANG Li
Format: Article
Language:zho
Published: Journal of Materials Engineering 2024-11-01
Series:Cailiao gongcheng
Subjects:
cryogenic titanium alloy
microstructure
mechanical property
deformation mechanism
Online Access:https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2024.000034
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In urgent demand for high-performance cryogenic titanium alloy for the heavy-lift launch vehicle， a novel 1500 MPa Ti-Al-V-Zr-Mo-Nb cryogenic titanium alloy （CT1400） was designed. Alloy bars and powder metallurgy materials of CT1400 were fabricated， and the microstructure， tensile properties， and cryogenic tensile deformation mechanism were also observed and analyzed. The results indicate that the CT1400 cryogenic titanium alloy mainly consists of α phase and a small quantity of β phase， which shows a typical near-α type cryogenic titanium alloy. CT1400 alloy bars display the apparent equiaxed fine-grain microstructure characteristic， and the powder metallurgy materials show the dominating lamellar microstructure combing with the “network” structure characteristic. CT1400 titanium alloys display excellent room and cryogenic tensile properties， which can stably reach cryogenic stress of 1500 MPa resulting from dislocation strengthening and grain boundary strengthening mechanisms. Furthermore， the twinning deformation at the cryogenic temperature of 20 K could additionally improve the cryogenic plastic deformation capacity of CT1400 titanium alloy by coordinating crystal orientation， promoting strain hardening， making it represent excellent coupling of strength and ductility at cryogenic temperatures.
ISSN:1001-4381

Similar Items