Ageing precipitation sequence and effect of. and secondary a phases on tensile properties of metastable β Ti-6Cr-5Mo-5V-4Al alloy

被引：9
作者：
Zhou, Wei [1 ]
Wang, Chang [1 ]
Liu, Ji-xiong [2 ]
LI, Si-yun [3 ]
Liu, Hui-qun [1 ,3 ]
机构：
[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
[2] Baoti Grp Ltd, Baoji 721014, Peoples R China
[3] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2023年 / 33卷 / 06期
关键词：
metastable beta-Ti alloy; precipitation sequence; omega-phase; as phase; strength; ductility; MECHANICAL-PROPERTIES; TITANIUM-ALLOY; OMEGA-PHASE; HEAT-TREATMENT; MICROSTRUCTURAL EVOLUTION; ASSISTED NUCLEATION; FRACTURE-TOUGHNESS; ALPHA-PHASE; TI ALLOY; CORROSION;
D O I：
10.1016/S1003-6326(23)66218-1
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The ageing precipitation sequence and the relationship between microstructure and tensile properties of metastable beta titanium alloy Ti-6Cr-5Mo-5V- 4Al during solution and ageing were investigated. Ageing from 400 to 450 degrees C, isothermal. phase (omega(iso)) precipitated in the alloy, resulting in high hardening and brittle fracture. After ageing at 450-500 degrees C,omega(iso) phase was gradually replaced by secondary alpha phase (a(s)) with the ageing time increasing. At higher ageing temperature (580-600 degrees C) omega(iso) precipitation was suppressed, and as phase precipitated directly from beta phase. The yield strength of sample aged at 450 degrees C for 12 h was 1368 MPa and the elongation was 5.5% due to omega(iso) precipitation. The yield strength of sample aged at 600 degrees C for 12 h was 1108 MPa and the elongation was improved to 15.4% due to the precipitation and coarsening of a(s) phase.
引用
收藏
页码：1742 / 1754
页数：13
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