Plastic deformation in a multifunctional Ti-Nb-Ta-Zr-O alloy

被引:0
|
作者
S. Kuramoto
T. Furuta
J. H. Hwang
K. Nishino
T. Saito
机构
[1] Toyota Central R&D Laboratories Inc.,
来源
Metallurgical and Materials Transactions A | 2006年 / 37卷
关键词
Material Transaction; Titanium Alloy; Plate Specimen; Foil Specimen; Ideal Strength;
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中图分类号
学科分类号
摘要
Mechanisms for plastic deformation in the newly developed Ti-24 at. pct (Ta + Nb + V)-(Zr,Hf)-O alloys (Gum Metal) were investigated in relation to their unique properties. Transmission electron microscopy revealed that the microstructure after deformation was characterized by highly distorted crystal images, which are accompanied by numerous “giant faults.” Such plastic behavior implies that a large amount of elastic stain energy was stored discretely and hierarchically during cold working. Calculated elastic constants of the Ti-X (Nb,Ta,Mo,V) binary systems predicted that Young’s modulus in 〈001〉 and shear moduli along some directions including slip systems in a bcc crystal were extraordinary small. The low modulus not only well explains the highly distorted microstructure observed in the cold-worked specimens, but also signifies that ideal shear strength of the developed alloys is a very small value, which is close to the practical strength required for plastic deformation in the alloy. This implies that the giant faults observed in the deformed specimen were formed without the aid of dislocation glide.
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页码:657 / 662
页数:5
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