Principal investigator: P. Chris Pistorius
University: Carnegie Mellon University
Industry partner: Arconic
As-cast samples will be tested to determine whether hydrogen embrittlement contributes to the cold cracking of 7000-series aluminum alloy ingots produced by direct-chill casting. The samples will be supplied by the industrial partner, Arconic, and mechanically tested and characterized at Carnegie Mellon University. The work will aim to clarify the role of intermetallic phases: such phases can lead to brittle failure, and can also act as hydrogen-producing sites, contributing to hydrogen embrittlement. Conversely, intermetallics can counteract embrittlement by acting as hydrogen traps. Based on the observed effects of alloy purity, macrosegregation, and intermetallic behavior during cracking, specific recommendations for targeted impurity control will be formulated.