Cyanide in Alloys by Electron Microscopy

  • Wenjun Kou, Zhijia Sun


The purpose of this paper is to study the imaging of cyanide in alloys in an electron microscope, and exploring new LPSO structures in magnesium alloys, studying defects in the LPSO structure and interface characteristics, understanding the mechanism of its formation and growth. This paper characterizes LPSO and its related structures in Mg97Zn1Y2 alloy by (scanning) transmission electron microscopy. At the same time, a new method for determining the Bravais cell in any three-dimensional lattice is proposed, That is, by finding the symmetry of the lattice to determine its Bravais lattice type and lattice parameters, Summarized the methods and specific steps for determining the position of the unknown crystal structure Bravais lattice, space group and three-dimensional atom by transmission electron microscopy systematically. Determined the Bravais lattice of the MgZnY phase, and the space group of the Mg3 (Co, Y) phase and the position of the three-dimensional atom. The experimental results show that the shape of the particles has not changed before and after adsorption. Which shows that cyanide has good mechanical stability; however, the particles become larger after adsorption, which may be due to cyanide entering the film during the adsorption process, causing the cyanide particles to aggregate, resulting in the particles becoming larger? The dislocation column of the b1 part of the periodic distribution and the b2, b3 double nuclear dislocation column form two pure tilt transition interface of 54 R / Mg and 54 R / 18 R, its tilt angle is 2.23°.Through the coordinated movement of b1 and b2, b3 dislocations can achieve the growth of 18R, and since the sum of the dislocations in one cycle is zero, all macroscopic strains are not generated.