Preparation of porous Ti35Nb alloy and its mechanical properties under monotonic and cyclic loading

The Ti-35%Nb（mass fraction） foams were prepared by a powder metallurgy method,and the microstructure and the mechanical properties of the foams under monotonic and cyclic loading were investigated.The microstructure of the foams mainly consists of β phase,and the foams exhibit the homogenous pore di...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2010-03, Vol.20 (3), p.390-394
Main Author: 林建国 张云飞 马蓦
Format: Article
Language:English
Subjects:
Fatigue (materials)
Fatigue failure
fatigue properties
Foamed metals
Foams
Mechanical properties
Microstructure
Porosity
powder metallurgy
Stress strain curves
Ti35Nb foams
Titanium base alloys
力学性能
应力应变
循环加载
泡沫材料
疲劳强度
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Summary:The Ti-35%Nb（mass fraction） foams were prepared by a powder metallurgy method,and the microstructure and the mechanical properties of the foams under monotonic and cyclic loading were investigated.The microstructure of the foams mainly consists of β phase,and the foams exhibit the homogenous pore distribution with the average pore size of 252 μm.The foams with 66% porosity show a typical stress—strain curve of the open-cell foams,and the plateau stress is about 56 MPa.The fatigue strength of the foam is 15.12 MPa at 107 cycles.The fractographic analysis of the foams reveals that the cracks nucleate within the struts and grow in a fatigue mechanism,resulting in the acceleration of the fatigue damage of the foams.
ISSN:1003-6326
DOI:10.1016/S1003-6326(09)60151-5