Characterisation of the rheological behaviour in the semi-solid state of grain-refined AZ91 magnesium alloys

This paper is a study of rheological analysis of magnesium alloys of groups Mg-Zn-Al and Mg-Zn-RE. It presents the results of high-temperature measurements of magnesium alloys, along with rheological analysis of their behaviour. Magnesium alloys are a very attractive material, due to their light weight and good plastic properties; on the other hand this material is very reactive in a liquid (semi-solid) state, which is challenging from a testing and forming perspective. The findings obtained were compared with five types of rheological models describing rheological characteristics of viscous systems. The analysis was carried out using Rheoplus software. As a result of the conducted work, the mathematical descriptions which are best for characterising rheological behaviour of semi-solid magnesium alloys containing 20% of the solid phase have been proposed.

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Semi-Solid Moulding of AZ91D Magnesium Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.850.790 ◽

2016 ◽

Vol 850 ◽

pp. 790-801

Author(s):

Hong Xu ◽

Xin Zhang ◽

Chang Shun Wang ◽

Jin Chuan Hu ◽

Cheng Wang ◽

...

Keyword(s):

Mechanical Properties ◽

Solid State ◽

Magnesium Alloy ◽

Magnesium Alloys ◽

Metal Forming ◽

Forming Process ◽

Microstructural Characteristics ◽

Az91d Magnesium Alloy ◽

Key Points ◽

Semi Solid

AZ91D magnesium alloy is one of the most widely used magnesium alloys in the production of metal forming, which use the characteristics from liquid state to solid state of metal to form. The present status of the research and application of the semi-solid forming for AZ91D magnesium alloys at present was reviewed in this paper, including the microstructural characteristics, the thixotropic and rheological behavior, the forming process of semi-solid for AZ91D magnesium alloys and the mechanical properties of the parts made of semi-solid magnesium alloys. The developing prospects and the key points of the semi-solid forming for AZ91D magnesium alloys were forecasted, and the industrial application of the alloy were also discussed.

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Study on Partial Remelting Microstructures and Mechanical Properties of ZK60-RE Magnesium Alloy

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.116-117.279 ◽

2006 ◽

Vol 116-117 ◽

pp. 279-283

Author(s):

Wei Wei Shan ◽

Zhi Ming Du ◽

Shou Jing Luo

Keyword(s):

Mechanical Properties ◽

Solid State ◽

Magnesium Alloy ◽

Magnesium Alloys ◽

Equal Channel Angular Extrusion ◽

High Strength ◽

High Quality ◽

Partial Remelting ◽

Semi Solid ◽

Re Elements

ZK60-RE is a kind of high strength magnesium alloy. Here, starting materials are casting ZK60-RE magnesium alloy and ZK60-RE magnesium alloy extruded by equal channel angular extrusion (ECAE), reheating to semi-solid state and studied on their partial remelting microstructures by means of microscope. The results show that ZK60-RE magnesium alloy extruded by ECAE are much finer and lead to the formation of spheroids quite rapidly while RE elements modified casting need a little longer time. At the same time, the mechanical properties of two kinds of ZK60-RE magnesium alloys are given. To do that, we want to find better magnesium alloys with high mechanical properties and good thixotropy, which adapt to semi-solid process to form the high quality complex component one time.

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