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Volume 6

Research & Reviews: Journal of Material Sciences

ISSN: 2321-6212

Materials Physics 2018

August 16-17, 2018

August 16-17, 2018 | London, UK

4

th

International Conference on

Condensed Matter and Materials Physics

Synthesis of a stable HCP-FCC mixture phase of the high-entropy superalloys

Al

0.15

Co

0.18

Cr

0.12

Fe

0.11

Ni

0.36

Ti

0.08

at high pressure

Chih Ming Lin

National Tsing Hua University, Taiwan

H

igh-entropy superalloys (HESA), Al

0.15

Co

0.18

Cr

0.12

Fe

0.11

Ni

0.36

Ti

0.08

, non-equimolar solid solutions of six elements, represent

a new strategy for the design of materials with properties superior to those of conventional alloys. However, their phase

space remains constrained, with transition metal high-entropy alloys containing FCC γ matrix with localized dispersion of L12

γ' particles. Here, we report the high-pressure synthesis of a stable HCP-FCC mixture phase of the prototypical high-entropy

superalloys Al

0.15

Co

0.18

Cr

0.12

Fe

0.11

Ni

0.36

Ti

0.08

.Thismartensitic transformation begins at 0.55GPa and is attributed to suppression of

the local magnetic moments, destabilizing the initial FCC γ structure. However, the behaviour of Al

0.15

Co

0.18

Cr

0.12

Fe

0.11

Ni

0.36

Ti

0.08

is unique in that the HCP phase is retained following decompression to ambient pressure, yielding a stable HCP-FCC mixture

phase. This demonstrates a means of tuning the structures and properties of high-entropy superalloys in a manner not

achievable by conventional processing techniques.

Recent Publications:

1. Lin CM et al. (2014) Pressure-induced structural phase transition in bulk Zn

0.98

Mn

0.02

O by angular dispersive X-ray

diffraction. J. Alloys and Compounds. 604C:298-303. Doi:10.1016/j.jaillcom.2014.03.055.

2. Lin C M et al. (2015) Pressure-Induced Phase Transitions in InAs studied by angular-dispersive x-ray diffraction and

roman spectroscopy. Science of Advanced Materials. 7:1039-1044. Doi:10.1166/sam.2015.2174.

3. Huang J M et al. (2015)

In situ

Al-doped ZnO films by atomic layer deposition with an interrupted flow. Material

Chemistry and Physics. 165:245-252. Doi:10.1016/j.matchemphys.2015.09.024.

4. Lin K L et al. (2016) Structural properties of pressure-induced structural phase transition of Si-doped GaAs by angular

dispersive X-ray diffraction. Appl. Phys. A. 122(2):117. Doi:10.1007/s00339-016-9660-3.

5. Huang J M et al. (2016) Enhanced electrical properties and field emission characteristics of AZO/ZnO-nanowire

core–shell structures. Phys. Chem. Chem. Phys. 18(22):15251-15259. Doi: 10.1038/s41598-018-19679-2.

Biography

Chih Ming Lin has his expertise in evaluation and passion in improving the health and wellbeing. Her open and contextual evaluation model based on responsive

constructivists creates new pathways for improving healthcare. His research interest include: the physical properties of high-entropy alloys (HEAs) and Topological

insulators (TIs) materials under high pressure and the process of synthesis of high-entropy alloys (HEAs) and Topological insulators (TIs) materials.

cm_lin@phys.nthu.edu.tw

Chih Ming Lin, Res. Rev. J Mat. Sci. 2018, Volume 6

DOI: 10.4172/2321-6212-C2-017