Grain Refinement in Aluminum Alloys by Acoustic Cavitation Phenomena
Journal Title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor - Year 2007, Vol 30, Issue 1
Abstract
In this article, ultrasonic method of transmitting forced vibrations to solidifying aluminum-alloy melts is presented. In the presence of well developed cavitation situations, a fine and homogeneous microstructure has been observed throughout the irradiated ingots. The effects produced when high-intensity sonic or ultrasonic waves are propagated through molten metals can be listed under three main categories: grain refinement, dispersive effects, and degassing resulting in reduced porosity. It has been found that vibrations of a mechanical origin are effective in increasing fluidity by as much as a factor of three and consequently, favorably influence the mold-filling ability of aluminum alloys. There appear to be two distinct views regarding the mechanism, which may be explained by the cavitation effects and the influence of the fluid-flow phenomena.
Authors and Affiliations
Luminita MORARU
Keywords
Related Articles
- EP ID EP662981
- DOI -
- Views 74
- Downloads 0
Destruction of the Inside Part of a Coat of a Hard Chrome Cylinder Used for Combustion Engines
This paper had as a starting point the broken down through explosion suffered by the coat of a cylinder made of cast iron. The cylinder coat material must provide the necessary resistance to dynamic and static stresses a...
Structural Aspects of Antifriction Properties Brass
a + β' brass types with antifriction properties belong to the category of hightensile brass, alloys which besides Cu and Zn also contain certain alloying materials introduced in order to obtain some special characteristi...
Effects of Plastic Deformation and Temperature on Microstructural and Mechanical Properties of a Cu Al Ni Shape Memory Alloy
In Cu 12.88% wt.Al4 %wt. Ni shape memory alloy the influence of plastic deformation and thermal treatments on the microstructures and hardness were studied by optical microscopy, scanning electron microscopy (SEM), Vicke...
Analytical Model of Forge Cutting Process with Asymmetrical Tools
In this paper is developed the theory of forge cutting process feasible with asymmetrical tools. The asymmetrical cutting process is different of the symmetrical cutting process. This type of process is necessary to real...
A Two-Step Inverse Analysis Approach Used to Identify the Mechanical Properties of Metallic Materials Subjected to Large Plastic Strains. Applications to Local Investigations of Surface Layer’s Behaviour
The aim of this research work is to improve the experimental and numerical analysis of the local mechanical properties corresponding to metallic alloys used by bulk forming processes. A non-onventional upsetting test and...