Influence of temper condition on microstructure and mechanical properties of semisolid metal processed Al-Si-Mg alloy A356
Authors: Möller, H.1; Govender, G.2; Stumpf, W.E.3; Knutsen, R.D.4
Source: International Journal of Cast Metals Research, Volume 22, Number 6, December 2009 , pp. 417-421(5)
Publisher: Maney Publishing
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Abstract:
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 results in spheroidisation of the eutectic silicon particles under the T4 and T6 temper conditions. The A356-T5 maintains the fibrous silicon morphology after artificial aging. A356-T4 has better ductility and impact strength than A356-T5 due to its spheroidised silicon morphology. The impact properties of semisolid metal high pressure die cast A356 are controlled mainly by the silicon morphology and alloy strength (hardness), whereas tensile strength is determined by the degree of solid solution coupled with precipitate formation during aging.Keywords: SEMISOLID METAL FORMING; ALLOY A356; MECHANICAL PROPERTIES; TEMPER CONDITIONS; IMPACT PROPERTIES
Document Type: Research article
DOI: 10.1179/174313309X436682
Affiliations: 1: Materials Science and Manufacturing, CSIR, Meiring Naude Road, Brummeria, Pretoria, Gauteng, 0001, South Africa;, Email: hmoller@csir.co.za 2: Materials Science and Manufacturing, CSIR, Meiring Naude Road, Brummeria, Pretoria, Gauteng, 0001, South Africa 3: Department of Materials Science and Metallurgical Engineering, University of Pretoria, Pretoria, South Africa 4: Centre for Materials Engineering, University of Cape Town, Cape Town, South Africa
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