MICROMORPHOLOGY OF NEAR-THRESHOLD FATIGUE FRACTURE SURFACES

Acta Metall Sin

1989, Vol. 25

Issue (4): 67-72 DOI:

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MICROMORPHOLOGY OF NEAR-THRESHOLD FATIGUE FRACTURE SURFACES

YANG Jingjun;KE Wei Institute of Corrosion and Protection of Metals; Academia Sinica; Shenyang

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YANG Jingjun;KE Wei Institute of Corrosion and Protection of Metals; Academia Sinica; Shenyang. MICROMORPHOLOGY OF NEAR-THRESHOLD FATIGUE FRACTURE SURFACES. Acta Metall Sin, 1989, 25(4): 67-72.

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Abstract The fatigue fracture surface micromorphology in the near-threshold re-gion was studied in LD10 aluminum alloy and Ti-6A1-4V alloy. The SEM examina-tions show that the fracture surface of both alloys at low crack growth rates (1×10~(-7)—1×10~(-5)mm/cycle) takes on a cyclic cleavage facet appearance. The typical cy-clic cleavage facets were either sawtoothed facets or terraced facets for LD10 andisolated island facets for Ti-6A1-4V alloy. The paper explicated the mechanism ofnear-threshold fatigue crack growth on the basis of experimental observations

Key words: fatigue crack fractograph near-threshold

Received: 18 April 1989

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1989/V25/I4/67

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