Grain Growth Model of Ultra-Fine Grain AZ80 Magnesium Alloy Multi-Directionally Forged During the Isothermal Heating Process
Journal Title: Materials Science-Medžiagotyra - Year 2019, Vol 25, Issue 2
Abstract
This paper takes the ultra-fine grain AZ80 magnesium alloy multi-directionally forged as the research object. We observe its heating behavior at 673 K with an optical microscope, analyze the grain size distribution, and the change of average grain size and hardness with different heating time, study the effect of heating time on the grain size change of ultra-fine grain AZ80 magnesium alloy, deduce and verify the grain growth model of ultra-fine grain AZ80 magnesium alloy during its heating process. The research results show that the 24-pass multi-directional forging can make ultra-fine grain AZ80 magnesium alloy of an average grain size of 0.73 μm. When ultra-fine grain AZ80 magnesium alloy is isothermally heated at 673K, its average grain size grows continuously as time extends. Its average grain size and hardness fall into two stages as the heating time changes, namely rapid grain growth stage and stable grain growth stage. If the heat preservation time is less than 300 s, the average grain size grows rapidly as temperature rises; When the heat preservation time reaches 300 s, the grain growth speed will be stable. A grain growth model is established for AZ80 magnesium alloy, which is D2.8932 = D02.8932 + 4.09086 × 10-3t1.6284 under the conditions of isothermal heating, whose computed result well coincides with the measured value.
Authors and Affiliations
Jinlong ZHANG, Hui XIE, Ying MA, Shiping TAO, Kun ZHAO, Weigang WU
Keywords
Related Articles
- EP ID EP581456
- DOI 10.5755/j01.ms.25.2.19093
- Views 34
- Downloads 0
Turbulence Imaging Simulation Based on Electrically Tunable Polymer Dispersed Liquid Crystals Cell
In this study, the scattering properties of polymer dispersed liquid crystals (PDLC) and its optical features for use in turbulence image simulation are presented. A PDLC cell composed of a liquid crystal/monomer mixture...
Multi-response Optimization of End Milling Parameters for Al-Zn-Mg/SiC Co-continuous Composite Using Response Surface Methodology
A co-continuous ceramic composite (C4) was manufactured by gravity infiltration. The effect of varying machining parameters namely, speed, feed and depth of cut during end milling of C4, on the multi-responses of surface...
Influence of Heat Treatment on the Static Bending Strength of Spruce Wood
The goal of this investigation was to find out influence of heat treatment at low temperatures on the Lithuanian spruce wood bending strength. The influence of heating temperature and duration on the strength of spruce w...
Influence of Graphene Sheet on Microstructure and Properties of Ni-based Alloy Coatings Prepared by Laser Cladding
Ni-based alloy cladding layers with different graphene sheet additions were prepared by laser cladding on the 40CrNi2Si2MoV steel substrate. The influence of the graphene sheet on the microstructure and properties of the...
Optimum Control Parameters During Machining of LM13 Aluminum Alloy Under Dry Electrical Discharge Machining (EDM) With A Modified Tool Design
Dry Electrical Discharge Machining(EDM) is considered as a green manufacturing process in which the liquid dielectric medium is replaced by a high velocity gas, which results improved process stability. A special tool de...