A thermo-mechanical correlation with driving forces for hcp martensite and twin formations in the Fe–Mn–C system exhibiting multicomposition sets

The thermodynamic properties of the Fe–Mn–C system were investigated by using an analytical model constructed by a CALPHAD approach. The stacking fault energy (SFE) of the fcc structure with respect to the hcp phase was always constant at T0, independent of the composition and temperature when other related parameters were assumed to be constant. Experimental limits for the thermal hcp formation and the mechanical (deformation-induced) hcp formation were separated by the SFE at T0. The driving force for the fcc to hcp transition, defined as a dimensionless value –dGm/(RT), was determined in the presence of Fe-rich and Mn-rich composition sets in each phase. Carbon tended to partition to the Mn-rich phase rather than to the Fe-rich phase for the compositions studied. The results obtained revealed a thermo-mechanical correlation with empirical yield strength, maximum true stress and maximum true strain. The proportionality between thermodynamics and mechanical properties is discussed

Accessibility and Acceptance for University Students with Diverse Abilities

The Americans with Disabilities Act (ADA) was enacted in 1990, comprehensively addressing the life needs and civil rights of people with disabilities (PWDs). Although the ADA would prohibit discrimination in the workforce, public services, transportation, and information, therefore spurring efforts by private and public institutions to plan for and adopt accessible environments and practices, the actual voice and experience of PWDs often remains unacknowledged, even on university campuses and in academic programs that purport to have progressive ideals. This chapter examines the efforts made by one midsized, comprehensive, American university not only to remove architectural, social, and academic barriers to student success as required by law, but to establish an academic voice for the disability experience and the disability rights movement through the newly founded Accessibility Studies Program