Related Experiment Video
Updated: Jan 31, 2026

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
Published on: March 7, 2018
Simulation Study of Helium Effect on the Microstructure of Nanocrystalline Body-Centered Cubic Iron
1College of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai 264005, China. xuchunping@ytu.edu.cn.
Abstract:
Helium (He) effect on the microstructure of nanocrystalline body-centered cubic iron (BCC-Fe) was studied through Molecular Dynamics (MD) simulation and simulated X-ray Diffraction (XRD). The crack generation and the change of lattice constant were investigated under a uniaxial tensile strain at room temperature to explore the roles of He concentration and distribution played in the degradation of mechanical properties. The simulation results show that the expansion of the lattice constant decreases and the swelling rate increases while the He in the BCC region diffuses into the grain boundary (GB) region. The mechanical property of nanocrystalline BCC-Fe shows He concentration and distribution dependence, and the existence of He in GB is found to benefit the generation and growth of cracks and to affect the strength of GB during loading. It is observed that the reduction of tensile stress contributed by GB He is more obvious than that contributed by grain interior He.
More Related Videos
Related Concept Videos
Lattice Centering and Coordination Number
Types of Unit Cells
Imagine taking a large number of identical...
Center of Gravity
Center of Gravity
To determine its location, the principle of moments can be utilized by dividing the object into...
Center of Mass
The knowledge of the center of mass can also help us to describe and predict the motion of objects. For example, when a ball is thrown...
Instantaneous Center of Zero Velocity
To analyze this, consider two points on the wheel: point A and point B. The absolute velocity of point B can be expressed as the vector sum of the absolute velocity of point A and the relative velocity of point B with respect to point A. To simplify this analysis,...
Patient-centered Care

