GSW0403 Phase stress measurement in SiCp/2024 under axial loading by TOF

Abstract

The neutron diffraction method was applied to measure the loading stresses in a monolithic aluminum alloy (Al2024) and an aluminum alloy reinforced with silicon carbide particles (SiCp/Al2024). Under uniaxial loading, the longitudinal and transverse strains were measured by the time of flight (TOF) method. The lattice strains obtained from several diffraction lines were determined. The strain in the longitudinal direction increased proportionally to the applied stress, while the transverse strain decreased with applied stress. The elastic constants measured by the neutron method was compared with the value predicted by the kroener model. For the results of monolithic aluminum alloy, the peak intensity of more than 300 counts was required to determine the lattice strain with sufficient reliability. The intensity of Al200 diffraction was high enough to determine the lattice strain in both longitudinal and transverse directions. The elastic constants agreed well with the predicted values. For the composite, the loading stresses in each constituent phase of the aluminum alloy and the silicon carbide particles were measured. Diffractions from SiC102, SiC110 and Al200 were suitable for the determination of the lattice strain. The measured strain were compared with the values predicted by the inclusion models. The measured results close to the predicted values. The macro stress calculated by the rule of mixture agreed very well with applied stress.