Grain Growth Behavior of AlMg5 Alloy Fabricated by Using a New Mg Mother Alloy Containing Al2Ca during Homogenization and Hot Compression

2016 ◽  
Vol 877 ◽  
pp. 328-333
Author(s):  
Bong Hwan Kim ◽  
Young Ok Yoon ◽  
Shae K. Kim

Grain growth behavior of AlMg5 alloy fabricated by using a new Mg mother alloy containing Al2Ca (referred to as AlMg5-Al2Ca hereinafter) was investigated during homogenization and subsequent hot compression test. Normal AlMg5 alloy using a commercial Mg mother alloy showed abnormally grown large grains in its microstructure after homogenization at 520 ̊C for 12hrs, while the grain growth in the AlMg5-Al2Ca alloy was completely suppressed by formation of stable Al4Ca during solidification on grain boundary. The compressive flow stress of normal AlMg5 alloy at 400 ̊C was significantly increased after homogenization because of lack of grains having proper slip directions to the applied load. But the flow stress of AlMg5-Al2Ca alloy showing no grain growth during homogenization was slightly decreased implying lower energy needed for subsequent thermo-mechanical processing.

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1004 ◽  
Author(s):  
Xianguang Zhang ◽  
Kiyotaka Matsuura ◽  
Munekazu Ohno

The occurrence of abnormal grain growth (AGG) of austenite during annealing is a serious problem in steels with carbide and/or nitride particles, which should be avoided from a viewpoint of mechanical properties. The effects of cold deformation prior to annealing on the occurrence of AGG have been investigated. It was found that the temperature range of the occurrence of AGG is shifted toward a low temperature region by cold deformation, and that the shift increases with the increase of the reduction ratio. The lowered AGG occurrence temperature is attributed to the fine and near-equilibrium AlN particles that are precipitated in the cold-deformed steel, which is readily dissolved during annealing. In contrast, coarse and non-equilibrium AlN particles precipitated in the undeformed steel, which is resistant to dissolution during annealing.


2016 ◽  
Vol 87 (11) ◽  
pp. 1450-1460 ◽  
Author(s):  
Sha-Sha Li ◽  
Yao-Hui Liu ◽  
Yu-Lai Song ◽  
Ling-Nan Kong ◽  
Tuan-Jie Li ◽  
...  

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