13,829 research outputs found
Tunable stacking fault energies by tailoring local chemical order in CrCoNi medium-entropy alloys
High-entropy alloys (HEAs) are an intriguing new class of metallic materials
due to their unique mechanical behavior. Achieving a detailed understanding of
structure-property relationships in these materials has been challenged by the
compositional disorder that underlies their unique mechanical behavior.
Accordingly, in this work, we employ first-principles calculations to
investigate the nature of local chemical order and establish its relationship
to the intrinsic and extrinsic stacking fault energy (SFE) in CrCoNi
medium-entropy solid-solution alloys, whose combination of strength, ductility
and toughness properties approach the best on record. We find that the average
intrinsic and extrinsic SFE are both highly tunable, with values ranging from
-43 mJ.m-2 to 30 mJ.m-2 and from -28 mJ.m-2 to 66 mJ.m-2, respectively, as the
degree of local chemical order increases. The state of local ordering also
strongly correlates with the energy difference between the face-centered cubic
(fcc) and hexagonal-close packed (hcp) phases, which affects the occurrence of
transformation-induced plasticity. This theoretical study demonstrates that
chemical short-range order is thermodynamically favored in HEAs and can be
tuned to affect the mechanical behavior of these alloys. It thus addresses the
pressing need to establish robust processing-structure-property relationships
to guide the science-based design of new HEAs with targeted mechanical
behavior.Comment: 23 pages, 5 figure
On the Application of Translation Quality Assessment Model in MTI Teaching
The 21st century is an era of globalization with rapid development of information technology and there are more and more close exchanges among countries. Under this background, the importance of translation is self-evident, and MTI (Master of Translation and Interpreting) teaching, which is closely related to it, has also attracted increasing attention. On the whole, after over ten years of development, translation teaching in China has begun to take shape. Both major foreign language colleges and foreign language departments of various comprehensive colleges have set up corresponding translation courses. But at present, the teaching effect of MTI is far from satisfaction. Based on the translation quality assessment model of Malcolm Williams, the necessity and possibility of the application of the translation quality assessment model in MTI teaching is explored, and the concept of the application of the translation quality assessment model in the classroom is put forward, aiming to establish an objective and effective evaluation system in MTI teaching so as to further promote the development of MTI teaching
- …