Volume 19, Issue 9 (2019)                   Modares Mechanical Engineering 2019, 19(9): 0-0 | Back to browse issues page

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Yousefi F, Taghiabadi R, Baghshahi S. Improving the mechanical properties of Mn-rich Al-4Ni-4Mn alloy by increasing the solidification rate and friction stir processing. Modares Mechanical Engineering. 2019; 19 (9)
URL: http://journals.modares.ac.ir/article-15-25770-en.html
1- Graduate student
2- Assistant professor , taghiabadi@ikiu.ac.ir
3- Professor
Abstract:   (61 Views)
Hypoeutectic Al-Ni alloys due to their excellent castability and appropriate high-temperature specific strength are extensively used in automotive and aerospace industries. The addition of Mn to the composition of these alloys promotes the formation of Mn-rich precipitates and improves their strength and hardness, especially at high temperatures. However, if the Mn content exceeds 2 wt. %, increasing the size and volume fraction of Mn-rich compounds adversely affects the mechanical properties, especially the ductility and toughness. On this basis, the current study was aimed to control the negative impact of high Mn content on tensile properties of hypoeutectic Al-Ni alloys. For this purpose, the Al-4Ni-4Mn samples, prepared under different solidification rates of 3.5 and 10.4 °C/s were subjected to friction stir processing (12 mm/min, 1600 rpm). Microstructural characterization and image analysis results imply on substantial refinement of second-phase particles and their even distribution in the matrix, refinement of grains, and elimination of casting defects such as gas/shrinkage porosities and entrained oxide bifilms. According to the results, increasing the solidification rate and applying of friction stir processing improved the tensile strength, yield strength, fracture strain, toughness, and microhardness of alloy by 63, 55, 123, 188 and 58%, respectively. 
     

Received: 2018/10/3 | Accepted: 2019/06/9 | Published: 2019/06/9

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