Crack Propagation in As-Extruded and Heat-Treated Mg-Dy-Nd-Zn-Zr Alloy Explained by the Effect of LPSO Structures and Their Micro- and Nanohardness.

The investigation of the crack propagation in as-extruded and heat-treated Mg-Dy-Nd-Zn-Zr alloy with a focus on the interaction of long-period stacking-ordered (LPSO) structures is the aim of this study. Solution heat treatment on a hot extruded Mg-Dy-Nd-Zn-Zr (RESOLOY) was done to change the initial fine-grained microstructure, consisting of grain boundary blocky LPSO and lamellar LPSO structures within the matrix, into coarser grains of less lamellar and blocky LPSO phases. C-ring compression tests in Ringer solution were used to cause a fracture.

An uncommon presentation of orbital apex syndrome.

Background: Bilateral total ophthalmoplegia secondary to a malignancy or infection of the cavernous sinus and orbital apex is an unusual presentation. Bilateral ophthalmoplegia as the initial sign of this type of rhinocerebral pathology is also uncommon.

Case Report: A 34-year old Haitian woman presented with bilateral vision loss, ptosis, total ophthalmoplegia, and ocular pain.