Tensile properties and fractographs of Ti-2.5Al-1.5Mn foils at different temperatures

The tensile properties and fractographs of Ti- 2.5Al-1.5Mn foils at different temperatures were investi- gated. It is observed that material properties closely cor- relate with the thickness （T） to grain size （d） ratio and deformation temperature. Tensile analysis shows that local deformation is the...

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Bibliographic Details
Published in:Rare metals 2017-04, Vol.36 (4), p.247-255
Main Authors: Ma, Zhen-Wu, Tong, Guo-Quan, Chen, Feng
Format: Article
Language:English
Subjects:
Biomaterials
Chemistry and Materials Science
Crack initiation
Crystal dislocations
Deformation
Deformation analysis
Deformation effects
Dimpling
Ductility
Energy
Foils
Formability
Forming
Fracture mechanics
Grain size
Grains
Hardening
High temperature
Material properties
Materials Engineering
Materials Science
Metallic Materials
Nanoscale Science and Technology
Phase transitions
Physical Chemistry
Plastic deformation
Room temperature
Stress concentration
Temperature
Tensile properties
Tensile strength
Titanium
变形温度
变形特征
局部变形
抗拉性能
拉伸性能
断口形貌
晶粒尺寸
材料性能
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Summary:The tensile properties and fractographs of Ti- 2.5Al-1.5Mn foils at different temperatures were investi- gated. It is observed that material properties closely cor- relate with the thickness （T） to grain size （d） ratio and deformation temperature. Tensile analysis shows that local deformation is the main deformation feature in foils forming at room temperature, which may lead to premature fracture. The causes of inhomogeneous deformation behavior are the limited number of deformable grains contained in deformation zone and the weak transferability of hardening among different grains. Fracture analysis reveals that the size of dimples can represent the ductility of foils at room temperature. With the further increase of deformation temperature, the main plastic deformation mode of foils is transformed from intragranular disloca- tions and twin crystal to grain-boundary gliding and roll- ing. In conclusion, foil forming at elevated temperature can increase the hardening transferability and the number of deformable grains in deformation zone, which is an effective method to improve the formability and reduce the scatter of material properties.
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-016-0835-z