Grain boundary segregation and hydrogen-induced fracture in 7050 aluminium alloy

Journal Article · Thu Aug 01 00:00:00 EDT 1996 · Acta Materialia

DOI:https://doi.org/10.1016/1359-6454(95)00406-8· OSTI ID:367330

Song, R G; Tseng, M K; Zhang, B J; Liu, J; Jin, Z H ^[1]; Shin, K S ^[2]

---

1. Northeastern Univ., Shenyang (China)
2. Seoul National Univ. (Korea, Republic of)

The relationships between grain boundary segregation and crack growth of stress corrosion and corrosion fatigue in 7050 aluminium alloy have been investigated under various aging conditions; the effects of grain boundary segregation on intergranular fracture work have been calculated using a quasichemical approach. The results show that the hydrogen content at the crack tip and the crack growth rate increase with the concentration of solid solution Mg on increasing grain boundary; both Mg and H segregation induce the intergranular fracture work to decrease. Mg segregation accelerates H enriching and crack propagation. It is indicated that a Mg-H interaction occurs in the processes of corrosion fatigue as well as stress corrosion.

• OSTI ID: 367330
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 8 Vol. 44; ISSN XZ504Y; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
AIR
ALUMINIUM BASE ALLOYS
CHEMICAL COMPOSITION
COPPER ALLOYS
CORROSION
CRACK PROPAGATION
CRACKS
FATIGUE
FRACTURE PROPERTIES
GRAIN BOUNDARIES
HYDROGEN
MAGNESIUM ALLOYS
METALLURGICAL EFFECTS
SEGREGATION
SOLID SOLUTIONS
WATER
ZINC ALLOYS