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Instruments / Technical Area	Publication Details	Published	Actions
I15-Extreme Conditions	Relating microstructure to magnetocaloric properties in RE36Tb20Co20Al24 (RE = Gd, Dy or Ho) high-entropy metallic-glass microwires designed by binary eutectic clusters method Hangboce Yin , Jun-Qiang Wang , Yongjiang Huang , Hongxian Shen , Shu Guo , Hongbo Fan , Juntao Huo , Jianfei Sun Journal Of Materials Science & Technology 92 DOI: 10.1016/j.jmst.2022.12.008 Diamond Proposal Number(s): [17412] Show Abstract ▼ Abstract: The new high-entropy metallic glasses (HE-MGs) are designed by using Dy and Ho to replace Gd in Gd36Tb20Co20Al24 alloy based on the binary eutectic clusters method. Compared with the equiatomic Gd25Tb25Co25Al25 HE-MG, the non-equiatomic RE36Tb20Co20Al24 (RE = Gd, Dy, or Ho) alloys show better glass-forming ability, which is attributed to the deep binary eutectic compositions used for alloy design. All RE36Tb20Co20Al24 alloys undergo second-order magnetic transition. An extreme peak value of magnetic entropy change is obtained as 10.3 J kg–1 K–1 (5 T) for the Ho36Tb20Co20Al24 alloy. In-situ high-energy synchrotron X-ray diffraction was conducted to observe the microstructural difference among non-equiatomic samples at cryogenic temperatures. The results indicate that Gd36Tb20Co20Al24 alloy possesses a relatively large average value of the dispersion of local clusters at a low-temperature range. This, combined with the critical exponent β close to 0.5 of Gd36Tb20Co20Al24 alloy, leads to its widest working temperature span among non-equiatomic samples. This work successfully establishes the connection between microstructure and magnetocaloric properties of HE-MGs, which is beneficial for understanding the physical mechanism of the magnetocaloric behaviors of HE-MGs.	Feb 2023
I12-JEEP: Joint Engineering, Environmental and Processing	Macroscopic analysis of time dependent plasticity in Ti alloys Yi Xiong , Phani S. Karamched , Chi-Toan Nguyen , David M. Collins , Christopher M. Magazzeni , Edmund Tarleton , Angus J. Wilkinson Journal Of Materials Science & Technology 25 DOI: 10.1016/j.jmst.2021.11.081 Diamond Proposal Number(s): [17222] Show Abstract ▼ Abstract: Component failure due to cold dwell fatigue of titanium and its alloys is a long-standing problem which has significant safety and economic implications to the aviation industry. This can be addressed by understanding the governing mechanisms of time dependent plasticity behaviour of Ti at low temperatures. Here, stress relaxation tests were performed at four different temperatures on three major alloy systems: commercially pure titanium (two alloys with different oxygen content), Ti-6Al-4V (two microstructures with differing phase fractions) and Ti-6Al-2Sn-4Zr-Mo (two alloys with different Mo content =2 or 6, and portion of phase). Key parameters controlling the time dependent plasticity were determined as a function of temperature. Both activation volume and energy were found to increase with temperature in all six alloys. It was found that the dwell fatigue effect is more significant by oxygen alloying but is suppressed by the addition of Mo. The presence of the phase did not strongly affect the dwell fatigue, however, it was suppressed at high temperature due to the low strain rate and strain rate sensitivity.	Apr 2022

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