TAILIEUCHUNG - Recent Advances in Mechatronics - Ryszard Jabonski et al (Eds) Episode 2 Part 2

Tham khảo tài liệu 'recent advances in mechatronics - ryszard jabonski et al (eds) episode 2 part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 424 M. Greger R. Kocich visible places of original boundaries decreased with increasing number of accomplished cycles. As it is demonstrated by the enclosed photos there can be seen evident traces of crystallisation Fig. 5 which refined the structure already after 3 cycles almost 20x if we take into consideration the original structure with average size of 120 pm Fig. 1 . Final microstructure of of AZ61 after 3rd pass at ARB process Dependence of grain size on rmter of cycles 0 0 8 1 6 2 4 Logaritnic strain e - Micro-structure of rolled materials indicates formation of new grains inside the original grains elongated in direction of rolling. Central parts of the rolled product are represented by fine-grain structure more than surface parts. The original boundaries disappeared at many places and new grains began to form at their place. High efficiency of this process is demonstrated also in the Fig. 6 which shows growth of strength of the alloy AZ91 in dependence on number of realised cycles in relation to the original non-deformed state. The values of strength increased more than times after five accomplished cycles 4 . Mechanical properties of AZ91 at the temperature 360 C Interposed deformation at the ARB process sufficed already after the 3rd cycle for decreasing of the grain size from the original size down under 10 pm in both types of alloys. Comparison of obtained strength in individual types of alloys after application of various forming technologies. It is evident that the best method for obtaining the highest values of strength is the ARB process however this is achieved at the expense of plastic properties. Contrary to that the ECAP technology is an optimum compromise. Superplasticity properties of magnesium alloys 425 3. Conclusion It is evident from micro-structures and mechanical tests that at high temperatures big elongation and lower strength are achieved after ECAP in comparison with conventional methods of forming which is caused .

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