Method for representing density of metal powder sintered body based on molecular dynamics

Abstract

The invention discloses a method for representing density of a metal powder sintered body based on molecular dynamics. The method comprises the following steps: (1) establishing a calculation simulation model for simulating laser sintering of metal powder; (2) adopting a molecular dynamics method, setting simulation parameters, and simulating the sintering process; (3) after the sintering simulation in the step (2) is finished, outputting the number Ni and the total volume V of atoms of various crystal structures of the sintered body according to a simulation result; and (4) calculating density according to an expression of the density D of the sintered body, wherein in the expression, i is the ith crystal structure in the sintered body, Ni is the number of all atoms of the ith crystal structure, ni is the unit cell atom number of the ith crystal structure to which the atoms belong, and Mi is the unit cell volume of the ith crystal structure to which the atoms belong. According to the method, the effect of representing the density of the sintered body is achieved on the theoretical level, the experimental quantity is reduced, the actual powder sintering cost is remarkably reduced, and the research and development efficiency is improved.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, in particular to a method for characterizing the density of a metal powder sintered body based on molecular dynamics. Background technique [0002] Powder metallurgy is an important material forming method. In order to save resources and reduce the amount of experiments, the use of simulation technology to simulate the sintering process of powder has increasingly become the development trend of modern materials science. There are various simulation methods and means for the powder metallurgy sintering process, among which the molecular dynamics method has a relatively mature application in the simulated sintering due to its simplicity and small amount of calculation. [0003] An important parameter of powder metallurgy is the density of the sintered body. In order to connect the theoretical simulation with the actual sintering process, more and more experts and scholars have theoretically charact...

AI Technical Summary

Problems solved by technology

However, most of the density formulas cited in the current literature come from experience and lack practical physical meaning. Therefore, it is very important to find a density characterization method with practical physical meaning.

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