Synthesis and Air Jet Erosion Study of Al X Fe 1.5 CrMnNi 0.5 ( x = 0.3, 0.5) High-Entropy Alloys
- PDF / 5,299,990 Bytes
- 12 Pages / 593.972 x 792 pts Page_size
- 24 Downloads / 156 Views
UCTION
A new concept of alloy design has been proposed by Yeh et al. in which there can be more than one principal element.[1,2] The alloys which developed based on this concept are known as high-entropy alloys (HEAs). By definition, high-entropy alloys have at least five principal metallic elements, each of them has a concentration between 5 and 35 at. pct.[1,3] Based on the conventional alloy design experience in metallurgy, an alloy with more than four principal elements will form complicated microstructure and it will be difficult to analyze the alloy because of the formation of many intermetallic compounds. The four core effects in high-entropy alloys
SAURAV KUMAR, DEVESH KUMAR and AJAYA KUMAR PRADHAN are with the Department of Metallurgical and Materials Engineering, MNIT, Jaipur 302017, India. ORNOV MAULIK is with the Anton Paar Pvt India Ltd, Gurugram 122001, India. VINOD KUMAR is with the Discipline of Metallurgy Engineering and Materials Science, IIT, Indore 453552, India. Contact e-mail: [email protected] AMAR PATNIAK is with the Department of Mechanical Engineering, MNIT, Jaipur 302017, India. Contact e-mail: [email protected] Manuscript submitted December 25, 2017 Article published online September 5, 2018 METALLURGICAL AND MATERIALS TRANSACTIONS A
would help in the formation of a simple solid solution. These effects are (1) high-entropy effect, (2) severe lattice distortion effect, (3) sluggish diffusion effect, and (4) cocktail effect. Recent studies on HEAs have shown that versatile properties can be achieved by this alloying concept, such as high strength,[4] good oxidation[5] and corrosion resistance,[6,7] high hardness,[8] and good wear resistance.[9,10] Formation of thin films and coatings[4–7,11] are also possible from this type of alloys. Al-Co-Cr-Cu-Fe-Ni-based HEA system has been studied in detail.[2,3,5] Shi et al.[12] have indicated that as aluminum content in AlxCoCrFeNi HEA system increases, the corrosion resistance decreases due to the formation of a dispersive passive film. Cao et al.[13] have reported that higher aluminum content in AlxCoCrFeNi HEA degrades the creep resistance of the alloy. Afterward, Co has been replaced by Mn and Cu has been removed to make this HEA system more economical and free from Cu-based segregation, respectively.[5] In order to make this alloy system further cheaper, Fe and Mn content were increased which also helped in increasing the wear resistance and strong nitride forming ability of the alloy.[9,14] Many literatures have shown the effect of aluminum content in AlxCoCrFeNi HEA system, and it is observed that with increasing the amount of aluminum, hardness increases, impact
VOLUME 49A, NOVEMBER 2018—5607
toughness decreases, and transformation of FCC to BCC phase occurs through FCC+BCC.[15–17] The present study is intended to develop an alloy system through ball milling route in which the samples are sintered through conventional sintering methods and to investigate the effect of aluminum concentration, on the phase evolution, hardness, and density. To the best
Data Loading...
