scholarly journals Microstructural changes of strained AZ91D magnesium alloys on semi-solid state.

1995 ◽  
Vol 45 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Shinji MATSUI ◽  
Kazutoshi SEKIHARA ◽  
Shigeharu KAMADO ◽  
Yo KOJIMA
Keyword(s):  
Solid State ◽  
Magnesium Alloys ◽  
Microstructural Changes ◽  
Semi Solid

Semi-Solid Moulding of AZ91D Magnesium Alloy

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.

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

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.

Stand-Alone Semi-Solid-State Electrochemical Systems Based on Bicontinuous Microemulsion Gel Films

2020 ◽  
Vol 92 (20) ◽  
pp. 14031-14037
Author(s):  
Hinako Hashimoto ◽  
Kyosei Goto ◽  
Kouhei Sakata ◽  
Satoshi Watanabe ◽  
Tomoyuki Kamata ◽  
...  
Keyword(s):  
Solid State ◽  
Electrochemical Systems ◽  
Bicontinuous Microemulsion ◽  
Semi Solid ◽  
Microemulsion Gel

Experimental Investigations And Numerical Modelling of 210CR12 Steel in Semi-Solid State

2011 ◽  
Author(s):  
Piotr Macioł ◽  
Władysław Zalecki ◽  
Roman Kuziak ◽  
Aleksandra Jakubowicz ◽  
Stanisław Węglarczyk
Keyword(s):  
Solid State ◽  
Numerical Modelling ◽  
Experimental Investigations ◽  
Semi Solid

Mechanical Properties of Thixoformed 7075 Feedstock Produced via the Direct Thermal Method

2015 ◽  
Vol 651-653 ◽  
pp. 1569-1574 ◽  
Author(s):  
Asnul Hadi Ahmad ◽  
Sumsun Naher ◽  
Dermot Brabazon
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Solid State ◽  
Tensile Testing ◽  
Thermal Method ◽  
Test Unit ◽  
Pouring Temperature ◽  
Injection Test ◽  
Semi Solid ◽  
Conventionally Cast

Abstracts: This paper presents an overview of measured mechanical properties of thixoformed aluminium 7075 feedstock produced by the direct thermal method (DTM). The DTM feedstock billets were processed with a pouring temperature of 685 °C and holding periods of 20 s, 40 s and 60 s before being quenched and subsequently thixoformed. A conventionally cast feedstock billet was produced with a pouring temperature of 685 °C and was allowed to solidify without quenching. The feedstock billets were later formed by an injection test unit in the semi-solid state. Tensile testing was then conducted on the thixoformed feedstock billets. Tensile properties for 7075 DTM thixoformed feedstock billets were found significantly influenced by the thixoformed component density. Samples with longer holding times were found to have higher density and higher tensile strength.

Evaluation of Strip Rolling Directly from the Semi-Solid State

2006 ◽  
Vol 116-117 ◽  
pp. 433-436 ◽  
Author(s):  
Antonio de Pádua Lima Filho ◽  
Márcio Iuji Yamasaki
Keyword(s):  
Solid State ◽  
Cooling System ◽  
Solid Alloy ◽  
Strip Rolling ◽  
Tin Alloys ◽  
Cooling Slope ◽  
Quality Issue ◽  
Lower Roller ◽  
Semi Solid ◽  
Strip Quality

The aim of this work is to study the solidification conditions necessary to produce good quality/low defect metal alloy strip when thixorolling directly from the semi-solid state. To facilitate the study lead/tin alloys were chosen for their relatively low operating temperature. The objective is to extrapolate these findings to the higher temperature aluminium alloys. Three alloys (70%Pb- 30%Sn, 60%Pb-40%Sn, 50%Pb-50%wtSn) were used particularly to study the influence of the solidification interval. The equipment consists of a two roll mill arranged as an upper and lower roller, where both rollers are driven at a controlled speed. The lower roller is fed with semi solid alloy through a ceramic nozzle attached to the lower end of a cooling slope. Several types of nozzle and their position at the roller were tested. This produced different solidifications and consequently different finished strip. The alloys were first cast and then poured onto the cooling slope through a tundish in order to create a continuous laminar flow of slurry and uniformity of metal strip quality. The pouring was tested at different positions along the slope. The cooling slope was coated with colloidal graphite to promote a smooth slurry flow and avoid the problem of adherence and premature solidification. The metallic slurry not only cools along the slope but is also initially super-cooled to a mush by the lower roller whilst at room temperatures, thus enabling thixorolling. It was also found that the nozzle position could be adjusted to enable the upper roller to also contribute to the solidification of the metallic slurry. However the rollers and the cooling slope naturally heat up. Temperature distribution in these zones was analysed by means of three thermocouples positioned along the cooling slope and a fourth in the base of the semi solid pool within the nozzle. The objective being to design an optimum pouring and cooling system. The formed strip was cooled down to room temperature with a shower of water. Microstructures of the thixorolling process were analysed. The differences in solidification conditions resulted in differing qualities of finished strip and corresponding defect types, all of which are a serious quality issue for the rolled product.

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