scholarly journals Current Progress in Rheoforming of Wrought Aluminum Alloys: A Review

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 238
Author(s):  
Gan Li ◽  
Hongxing Lu ◽  
Xiaogang Hu ◽  
Feng Lin ◽  
Xinwei Li ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Low Cost ◽  
Complex Structure ◽  
Extensive Study ◽  
The Subject ◽  
And Performance ◽  
Semi Solid ◽  
Wrought Aluminum Alloys ◽  
Wrought Aluminum ◽  
Microstructure And Performance

Semi-solid processing (SSP), including rheoforming and thixoforming, offers a promising opportunity to manufacture net-shaped parts with complex structure and excellent mechanical properties. Owing to its low cost and short process, rheoforming has been the subject of extensive study over the last two decades. The interest in the rheoforming of wrought aluminum alloys is progressively growing among both the research and industrial communities. This review starts with reviewing the recent efforts and advances on preparation of semi-solid slurry of wrought Al alloys, followed by discussing the correlation between microstructure and performance of these alloys. Finally, special attention is paid in the industrial application and the future trends of rheoforming of wrought aluminum alloys.

Rheoforging of Wrought Aluminum Alloys

2008 ◽  
Vol 141-143 ◽  
pp. 271-276 ◽  
Author(s):  
Hong Min Guo ◽  
Xiang Jie Yang
Keyword(s):  
Aluminum Alloys ◽  
High Performance ◽  
Metal Flow ◽  
Homogeneous Microstructure ◽  
High Solid Fraction ◽  
Casting Aluminum ◽  
Semi Solid ◽  
Wrought Aluminum Alloys ◽  
Solid Liquid ◽  
Wrought Aluminum

Wrought aluminum alloys have wide variety applications in aerospace and automobile industries, due to their superior properties compared to casting aluminum alloys. Rheoforging is a modification of thixoforging, which starts directly from the liquid phase instead of reheating of a billet. In the present process, suitable semi-solid slurries of wrought aluminum alloys are prepared by the LSPSF (low superheat pouring with a shear field) rheocasting process within 25s. The effects of processing conditions on the degree of spherical grain refinement in 2024, 6082 and 7075 alloys are discussed. 2024 and 7075 alloys have been used in order to investigate rheoformability of high performance aluminum alloy. Experimental results show that rheoforging based on LSPSF process can produce relatively homogeneous microstructure throughout the cup-shaped component. However, high solid fraction of semi-solid slurry promotes metal flow and results in solid/liquid segregation. Subsequent optimized heat treatments raise significantly the mechanical properties. Future potentials and challenges to be solved are discussed.

Use and minimization of water in leather tanning processes

1999 ◽  
Vol 40 (1) ◽  
pp. 237-244 ◽  
Author(s):  
O. Tünay ◽  
I. Kabdaşlı ◽  
D. Orhon ◽  
G. Cansever
Keyword(s):  
Water Use ◽  
Water Conservation ◽  
Complex Structure ◽  
Extensive Study ◽  
Pollution Load ◽  
Leather Processing ◽  
Leather Tanning ◽  
High Pollution ◽  
The Subject ◽  
Tanning Industry

Minimization of water use and reuse applications within industry has recently gained importance within the context of water conservation efforts. The leather tanning industry is one of the subject industries due to large amount of water to be disposed of together with a high pollution load. The leather tanning industry has a complex structure in terms of materials, processes and manufacturing practices. Therefore a systematic approach is required to assess water use practice. In this study, bovine leather processing was taken as an example. An extensive study was conducted as on-site evaluations and questionnaires in the İstanbul Organized Leather Tanning District to assess water use practices, patterns and minimization trends. Results of the study were discussed and important aspects of water minimization practices have been pointed out.

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