ResearchSpace
→
Browsing by Author

Browsing by Author "Stumpf, WE"

Now showing items 1-15 of 15

Alpha case formation mechanism in Ti-6Al-4V alloy investment castings using YFSZ shell moulds

Author: Bauristhene, AM ; Mutombo, K ; Stumpf, WE Date: Apr 2013 Ti-64, which accounts for more than 50% of the worldwide titanium tonnage, has found commercial importance in industries requiring components with high specific strength and resistance to corrosion. Investment casting is the preferred production ... Read more
Application of shortened heat treatment cycles on A356 automotive brake calipers with respective globular and dendritic microstructures

Author: Moller, H ; Govender, G ; Stumpf, WE Date: Sep 2010 The conventional casting alloy A356 is probably one of the most popular alloys used for semi-solid metal (SSM) forming. This is due to its high fluidity and good castability. This alloy can be heat treated alternatively to the T4, T5 or T6 ... Read more
Comparison of heat treatment response of semisolid metal processed alloys A356 and F357

Author: Moller, H ; Govender, G ; Stumpf, WE ; Pistorius, PC Date: 2010 The heat treatment response of semisolid metal high pressure die cast Al-7Si-Mg alloys A356 and F357 was studied and compared. It was found that the heat treatment behaviour of alloy F357 is influenced markedly by the stability of the Mg ... Read more
Comparison of the heat treatment response of SSM-HPDC 6082 and 6004 wrought alloys with A356 and F357 casting alloys

Author: Müller, H ; Govender, G ; Stumpf, WE Date: Jun 2011 Semi-solid metal high pressure die casting was used to produce plates from traditional wrought Al-Mg-Si alloys 6082 and 6004, as well as from traditional casting Al-Si-Mg alloys A356 and F357. The high Si-content of the casting alloys offer ... Read more
Comparison of the heat treatment response of wrought and SSM-HPDC alloy 6082

Author: Möller, H ; Govender, G ; Stumpf, WE Date: Jun 2011 The natural and artificial aging responses of wrought and SSM-HPDC alloy 6082 are compared. It is shown that the heat treatment response of this Al-Mg-Si alloy is not influenced by differences in microstructures produced by different processing ... Read more
Dynamic globularization of a-phase in Ti6Al4V alloy during hot compression

Author: Mutombo, K ; Siyasiya, C ; Stumpf, WE Date: Dec 2013 Ti6Al4V samples were isothermally compressed using a Gleeble (supTM) 1500D thermo-mechanical simulator. Differential scanning calorimetry (DSC), microstructural analyses, and thermodynamic calculations were used to investigate the sequence ... Read more
Formation of amorphous Ti-50at.%Pt by solid state reactions during mechanical alloying

Author: Mahlatji, ML ; Chikosha, S ; Chikwanda, HK ; Stumpf, WE ; Siyasiya, CW Date: Oct 2013 Mechanical alloying of an equiatomic mixture of crystalline elemental powders of Ti and Pt in a high-energy ball mill results in formation of an amorphous alloy by solid-state reactions. Mechanical alloying was carried out in an argon atmosphere ... Read more
Influence of temper condition on microstructure and mechanical properties of semisolid metal processed Al–Si–Mg alloy A356

Author: Moller, H ; Govender, G ; Stumpf, WE ; Knutsen, RD Date: 2009 The microstructures and mechanical properties of strontium modified semisolid metal high pressure die cast A356 alloy are presented. The alloy A356-F (as cast) has a globular primary grain structure containing a fine eutectic. Solution treatment ... Read more
Investigation of the T4 and T6 heat treatment cycles of semi-solid processed aluminium alloy A356

Author: Moller, H ; Govender, G ; Stumpf, WE Date: 2008 The heat treatment cycles that are currently applied to semi-solid processed components are mostly those that are in use for dendritic casting alloys. These heat treatments are not necessarily the optimum treatments. It is shown that a decrease ... Read more
Natural and artificial aging response of semi-solid metal processed alloy A356

Author: Möller, H ; Govender, G ; Stumpf, WE Date: Sep 2008 The heat treatment cycles that are currently applied to semi-solid processed components are mostly those that are in use for dendritic casting alloys. These heat treatments are not necessarily the optimum treatments for non-dendritic ... Read more
Natural and artificial aging response of semisolid metal processed Al–Si–Mg alloy A356

Author: Moller, H ; Govender, G ; Stumpf, WE Date: Dec 2007 International standards for aluminium alloys often permit significant fluctuations in the content of alloying elements. This allows metal suppliers more freedom in preparing these alloys. It is shown that the magnesium content of semisolid ... Read more
Optimisation of the T6 heat treatment of rheocast alloy A356

Author: Moller, H ; Govender, G ; Stumpf, WE Date: Nov 2007 The heat treatment cycles that are currently applied to processed components are mostly those that are in use for traditional dendritic alloys. These heat treatments are not necessarily the optimum heat treatments for SSM processing. The T6 ... Read more
Solute nanostructures and their strengthening effects in Al–7Si–0.6Mg alloy F357

Author: Sha, G ; Moller, H ; Stumpf, WE ; Xia, JH ; Govender, G ; Ringer, SP Date: Jan 2012 The solute nanostructures formed in the primary a-Al grains of a semi-solid metal cast Al–7Si–0.6Mg alloy (F357) during ageing at 180°C, and the age-hardening response of the alloy, have been systematically investigated by transmission electron ... Read more
T6 heat treatment of semi-solid metal processed alloy A356

Author: Moller, H ; Govender, G ; Stumpf, WE Date: 2008 Semi-solid metal (SSM) processing is a unique manufacturing method to produce near-net shape products for various industrial applications. The aim is to obtain a semi-solid structure free of dendrites (which are formed by conventional liquid ... Read more
Thermodynamic assessment of the Al-Ru system

Author: Prins, SN ; Cornish, LA ; Stumpf, WE ; Sundman, B Date: Mar 2003 The CALPHAD technique was used to calculate the Al-Ru binary phase diagram. The RuAl (B2) phase was described with the sublattice model (SL), also designated Compound Energy Formalism (CEF), as well as the Modified Sublattice Formalism (MSL), ... Read more

Now showing items 1-15 of 15

Browse

All of ResearchSpace

Quick Links

Legislation and compliance

General Enquiries

Tel: + 27 12 841 2911
Email: callcentre@csir.co.za

Physical Address
Meiring Naudé Road
Brummeria
Pretoria
South Africa

Postal Address
PO Box 395
Pretoria 0001
South Africa

Social Connect

Copyright © CSIR 2017. All Rights Reserved

Resources on this site are free to download and reuse according to associated licensing provision. Please read the terms and conditions of usage of each resource.