Laminated Nb/Nb₃Al composites: effect of layer thickness on fatigue and fracture behavior

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• 作者：Bloyer ; D.R. ; Venkateswara Rao ; K.T. ; Ritchie ; R.O.
• 关键词：Fracture ; Fatigue ; R-curve ; Intermetallic ; Nb ; Nb₃Al ; Laminates
• 刊名：Materials Science and Engineering: A
• 出版年：1997
• 出版时间：December, 1997
• 年：1997
• 卷：239-240
• 期：1-2
• 页码：393-398
• 全文大小：192 K

文摘

Fracture and fatigue crack growth properties of coarse scale Nb/Nb₃Al laminated composites are examined, and their performance is contrasted with similarly reinforced in situ particulate and microlaminate composites. It is found that laminate orientation has a larger effect on fatigue crack growth resistance than on fracture toughness; properties are optimal in the crack arrester as compared with the crack divider orientation. In addition, thicker Nb layers yield improved fracture and fatigue crack growth properties; and the effect is more prominent in the divider orientation. Mechanisms underlying this behavior are briefly described.