SHORT AND LONG FATIGUE CRACK-GROWTH IN A SIC REINFORCED ALUMINUM-ALLOY

被引：87

作者：

KUMAI, SJ

KING, JE

KNOTT, JF

机构：

[1] Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology, Yokohama

[2] Department of Materials Science and Metallurgy, University of Cambridge, Cambridge

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 1990年 / 13卷 / 05期

关键词：

D O I：

10.1111/j.1460-2695.1990.tb00621.x

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fatigue crack growth behaviour in a 15 wt% SiC particulate reinforced 6061 aluminium alloy has been examined using pre‐cracked specimens. Crack initiation and early growth of fatigue cracks in smooth specimens has also been investigated using the technique of periodic replication. The composite contained a bimodal distribution of SiC particle sizes, and detailed attention was paid to interactions between the SiC particles and the growing fatigue‐crack tip. At low stress intensity levels, the proportion of coarse SiC particles on the fatigue surfaces was much smaller than that on the metallographic sections, indicating that the fatigue crack tends to run through the matrix avoiding SiC particles. As the stress intensity level increases, the SiC particles ahead of the growing fatigue crack tip are fractured and the fatigue crack then links the fractured particles. The contribution of this monotonic fracture mode resulted in a higher growth rate for the composite than for the unreinforced alloy. An increase in the proportion of cracked, coarse SiC particles on the fatigue surface was observed for specimens tested at a higher stress ratio. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：511 / 524

页数：14

共 21 条

[1]

Crowe C.R., Gray R.A., The effect of notch root radius on crack initiation in SiCd/A1, Failure Mechanisms in High Performance Materials, pp. 157-166, (1984)

[2]

Yau S.S., Mayer G., Fatigue of metal matrix composite materials, Mater. Sci. Engng, 82, pp. 45-57, (1986)

[3]

Williams D.R., Fine M.E., pp. 639-670, (1985)

[4]

Shang J.K., Yu W., Ritchie R.O., Role of silicon carbide particles in fatigue crack growth in SiC‐particulate‐reinforced aluminium alloy composites, Mater. Sci. Engng A, 102, pp. 181-192, (1988)

[5]

Nain S.V., Tien J.K., Bates R.C., SiC‐reinforced aluminium metal matrix composites, Int. Metals Rev., 30, pp. 275-290, (1985)

[6]

Crowe C.R., Gray R.A., Hasson D.F., pp. 843-866, (1985)

[7]

Logsdon W.A., Liaw P.K., Tensile, fracture, toughness and fatigue crack growth rate properties of silicon carbide whisker and particulate reinforced aluminium metal matrix composites, Engng Fract. Mech., 24, pp. 737-751, (1986)

[8]

Davidson D.L., Fracture characteristics of A1‐4 pct Mg mechanically alloyed with SiC, Metall. Trans., 18 A, pp. 2115-2128, (1987)

[9]

Hasson D.F., Crowe C.R., Ahearn J.S., Cooke D.C., Fatigue and corrosion fatigue of discontinuous SiC/A1 metal matrix composites, Failure Mechanisms in High Performance Materials, pp. 147-156, (1984)

[10]

Roebuck B., Fractography of a SiC particulate reinforced aluminium metal matrix composite, J. Mater. Sci. Lett., 6, pp. 1138-1140, (1987)

← 1 2 3 →