|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||In-situ Fitness-for-Service Assessment of Aluminum Alloys Developed for Automotive Powertrain Lightweighting
||Ermia Aghaie, Joshua Stroh, Dimitry G. Sediako, Mathew Smith
|On-Site Speaker (Planned)
||Dimitry G. Sediako
The novelty of the study is in application of in-situ neutron diffraction to evaluate creep for individual crystallographic planes in automotive alloys under tensile load. The focus of the research was two aluminum alloys of Al-Si and Al-Cu systems. The starting temperature and pressure were similar to those experienced by automotive engine heads in service. The applied temperature and load were then increased incrementally until the eventual fracture of the test specimen, testing the application limits of the alloys in the next-generation engines.
The measurements provided data on plastic as well as elastic strain evolution for selected hkl crystallographic planes as a function of temperature, tensile load, and time. Addition subset of the data was on intergranular strains, or “damage accumulation”, during creep, leading to the hkl-specific fracture strain. This information contributes to in-depth understanding of why a particular alloy exhibits particular service properties, providing the bases for fitness-for-service assessment.
||Planned: Light Metals