Microstructure and mechanical properties of a rheo-diecast Mg-10Zn-4.5Al alloy

Liu, Yuqin, Qian, Ma and Fan, Z. (2005) Microstructure and mechanical properties of a rheo-diecast Mg-10Zn-4.5Al alloy. Materials Transactions, 46 10: 2221-2228. doi:10.2320/matertrans.46.2221

Author Liu, Yuqin
Qian, Ma
Fan, Z.
Title Microstructure and mechanical properties of a rheo-diecast Mg-10Zn-4.5Al alloy
Formatted title
Microstructure and mechanical properties of a rheo-diecast Mg–10Zn–4.5Al alloy
Journal name Materials Transactions   Check publisher's open access policy
ISSN 1345-9678
Publication date 2005
Sub-type Article (original research)
DOI 10.2320/matertrans.46.2221
Volume 46
Issue 10
Start page 2221
End page 2228
Total pages 8
Place of publication Sendai, Japan
Publisher 日本金属学会 [Japan Institute of Metals]
Language eng
Subject 0913 Mechanical Engineering
Formatted abstract
High zinc content Mg–Zn–Al alloys have the potential to be used as high pressure die casting (HPDC) alloys for applications up to 150°C. However, these alloys show high tendency to hot tearing and microporosity. Rheo-diecasting (RDC) is an innovative semisolid HPDC process, which can effectively eliminate the formation of primary magnesium dendrites and convert them into fine, globular particles. This very positive change in the morphology and distribution of the primary phase reduces the subsequent formation of various casting defects. In this study, a composition of Mg–10Zn–4.5Al was selected from the Mg–Zn–Al system and processed with both HPDC and RDC. It is shown that, samples produced by the RDC process exhibit substantially reduced hot cracks, few gas pores, and a nearly uniform distribution of fine, globular primary particles. These microstructural changes resulted in much improved strength and elongation, which are comparable to those of AZ91D, while the processing temperature is much lower. It is concluded that high zinc content Mg–Zn–Al alloys have good potential to be exploited as commercially useful alloys by the RDC process.
Keyword Magnesium alloys
Semisolid metal processing
High pressure die casting
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mechanical & Mining Engineering Publications
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Created: Wed, 25 Nov 2009, 15:32:33 EST by Ms Lynette Adams on behalf of School of Engineering