Hydrogen embrittlement in ductile Ni[sub 3]Al-effects of hydrogen content, strain rate and pre-deformation

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90368-3· OSTI ID:6327324

Li, Huaxin; Chaki, T K ^[1]

---

1. State Univ. of New York, Buffalo, NY (United States). Dept. of Mechanical and Aerospace Engineering

Hydrogen embrittlement has been studied in continuous cast sheet of an Ni[sub 3]Al alloy (Ni[sub 77.83]Al[sub 21.73]Zr[sub 0.34]B[sub 0.1]). When tensile tests were performed at the initial strain rate of 5.8 x 10[sup [minus]5]s[sup [minus]1], the elongation decreased from 32.7% for no charging to 1.9% for 330 min of cathodic charging with 50 mA/cm[sup 2] current, but the yield stress did not change. The fracture mode changed partially from dimple to intergranular and cleavage modes. At a faster strain rate of 5.8 x 10[sup [minus]3] s[sup [minus]1], hydrogen embrittlement was less pronounced, but the yield stress increased with hydrogen content and multiple cracks were generated. Plastically pre-deformed (2-26% elongations) and subsequently charged specimens failed after yielding, which occurred at the final pre-deformation stress. The results suggest that the grain boundary or the interior of the grain was not weakened by hydrogen, rather hydrogen-enhanced localized plasticity caused the loss of ductility in B-doped Ni[sub 3]Al alloy.

• OSTI ID: 6327324
• Journal Information: Acta Metallurgica et Materialia; (United States), Vol. 41:7; ISSN 0956-7151
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
HYDROGEN EMBRITTLEMENT
NICKEL ALLOYS
BORON ADDITIONS
ELONGATION
FRACTURE PROPERTIES
GRAIN BOUNDARIES
INTERMETALLIC COMPOUNDS
MATERIALS TESTING
PLASTICITY
STRAIN RATE
YIELD STRENGTH
ZIRCONIUM ADDITIONS
ALLOYS
BORON ALLOYS
EMBRITTLEMENT
MECHANICAL PROPERTIES
MICROSTRUCTURE
TESTING
ZIRCONIUM ALLOYS
360103* - Metals & Alloys- Mechanical Properties