Development of the fundamentals of melting and casting technology of Al-Me (Cr, Ni, Mo, W, Ti) master alloys used for modification of microstructure in silumins
Journal Title: Archiwum Odlewnictwa - Year 2009, Vol 9, Issue 2
Abstract
The study presents the technological backgrounds of the process of melting and casting Al-Cr, Al-Ni, Al-Mo, Al-W and Al-Ti master alloys, used as refiners of the microstructure of cast silumins. Basing on the analysis of phase equilibrium diagrams for an Al-Me (Cr, Ni, Mo, W, Ti) system at a temperature of 900oC, the characteristic intermetallic phases of AlxMey were investigated. Due to their similarity with Al and Si in respect of both structure and lattice arrangement, these phases may act as heterogeneous nuclei and promote solution hardening during, e.g., heat treatment. Using the method of thermal analysis ATD, the temperature was plotted in function of time, and then the characteristic values of the solidification parameters of master alloys were read out from the respective curves.
Authors and Affiliations
Jarosław Piątkowski
Bell founding – the past and the present
This paper outlines the history of bell founding. The exceptional character of bells, which are products of supracultural importance, was stressed. The complexity of the bell manufacturing process and a unique approach t...
Nitrogen hardening of creep-resistant G-NiCr28W alloy
In the group of creep-resistant materials, most important are heat-resistant nickel-based alloys. The G-NiCr28W alloy subject to detailed examinations was observed to have two different austenite-like phases. In the inte...
Studies of selected mechanical properties of nitinol – shape memory alloy
Because of their specific properties, shape memory alloys are applied in many domains. The investigations were conducted on nitinol alloy in the form of 3,1 mm diameter wire, whose Af temperature as stated by the manufac...
Application of calorimetry in evaluation of phase transformations in the selected hypoeutectic silumins
The investigations of phase transformations described in this study were carried out on hypoeutectic alloys from the Al-Si during heating and cooling. The determination and analysis of characteristic temperature values f...
The estimation of ability to reclame of moduling sands with biopolymer binders
Applied up till now organic binding materials, on the basis of synthetic resins are characterised by good technological properties, but cause high emission of harmful substances. That’s why contemporary scientific resear...