کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1579208 | 1001221 | 2011 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Alloy design for Al addition on microstructure and mechanical properties of Ni3(Si,Ti) alloy Alloy design for Al addition on microstructure and mechanical properties of Ni3(Si,Ti) alloy](/preview/png/1579208.png)
The effect of Al addition on the microstructure and tensile properties of Ni3(Si,Ti) alloys with an L12 ordered structure, which were fabricated through thermomechanical processing from arc-melted ingots, was investigated. Al was added to a Ni3(Si,Ti) alloy by using two methods such that Al substituted for (1) only Ti and (2) both Ni and Ti along a Ni3(Si,Ti)–Ni3Al pseudo-binary line. In the case of the alloys prepared by the former method, the addition of more than 4 at.% Al resulted in a two-phase microstructure consisting of disordered fcc Ni solid solution dispersions in the L12 matrix, while in the case of the alloys prepared by the latter method, the addition of 4 at.% Al retained the L12 single-phase microstructure. In the case of the 4 at.% Al-added alloys, the room-temperature tensile properties were similar and independent of the alloying methods, whereas the high-temperature yield stress was higher in the alloys prepared by the latter method than in the case of the alloys prepared by the former method. These results suggest that a single-phase microstructure consisting of an entire L12 structure is favorable for obtaining high-temperature tensile properties.
Research highlights
► The microstructure of the Ni3(Si,Ti) alloys depended on the alloying method of Al.
► The high-temperature mechanical properties were sensitive to the microstructure.
► Whole L12 single structure was favorable as high-temperature structural materials.
Journal: Materials Science and Engineering: A - Volume 528, Issue 12, 15 May 2011, Pages 4104–4110