Realizing improved strength–ductility synergy in eutectic alloys acting as in situ composite materials remains a challenge in conventional eutectic systems, which is why eutectic high-entropy alloys (EHEAs), a newly-emerging multi-principal-element eutectic category, may offer wider in situ composite possibilities. Here, we use an AlCoCrFeNi2.1 EHEA to engineer an ultrafine-grained duplex microstructure that deliberately inherits its composite lamellar nature by tailored thermo-mechanical processing to achieve property combinations which are not accessible to previously-reported reinforcement methodologies. The as-prepared samples exhibit hierarchically-structural heterogeneity due to phase decomposition, and the improved mechanical response during deformation is attributed to both a two-hierarchical constraint effect and a self-generated microcrack-arresting mechanism. This work provides a pathway for strengthening eutectic alloys and widens the design toolbox for high-performance materials based upon EHEAs. Producing in situ composite materials with superior strength and ductility has long been a challenge. Here, the authors use lamellar microstructure inherited from casting, rolling, and annealing to produce an ultrafine duplex eutectic high entropy alloy with outstanding properties.

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Enhanced strength–ductility synergy in ultrafine-grained eutectic high-entropy alloys by inheriting microstructural lamellae

VOLUME ONE: CLASSICAL AND CONTEMPORARY STUDIES Banana Time: Job Satisfaction and Informal Interaction - Donald Roy Perceptions and Methods in Men Who Manage - Melville Dalton Men and Women of the Corporation - Rosabeth Kanter Manufacturing Consent - Michael Burawoy Breakfast at Spiro's: Dramaturgy and Dominance - Michael Rosen The World of Corporate Managers - Robert Jackall Engineering Humour: Masculinity Joking and Conflict in Shop-Floor Relations - David Collinson Extract from Crafting Selves: Power Gender and Discourses of Identity in a Japanese Workplace - Dorinne Kondo Engineering Culture: Control and Commitment in a High-Tech Corporation - Gideon Kunda Theorizing Managerial Work: A Pragmatic Pluralist Approach to Interdisciplinary Research - Tony Watson Rational Choice Situated Action and the Social Control of Organizations: The Challenger Launch Decision - Diane Vaughan Strategizing as Lived Experience and Strategists - Dalvir Samra-Fredericks Power Control and Resistance in 'The Factory that Time Forgot' - Mahmoud Ezzamel et al. Extract from Talking about Machines: An Ethnography of a Modern Job - Julian Orr Extract from The Business of Talk: Organizations in Action - Diedre Boden Extract from Investigating Small Firms: Nice Work? - Ruth Holliday Narrative Interviewing and Narrative Analysis in a Study of a Cross-Border Merger - Anne-Marie Soderberg Speech Timing and Spacing: The Phenomenon of Organizational Closure - Francois Cooren and Gail T. Fairhurst, VOLUME TWO: METHODS APPROACHES TECHNIQUES: GUIDES AND EXEMPLARS The Infeasibility of Invariant Laws in Management Studies: A Reflective Dialogue in Defence of Case Studies - Tsuyoshi Numagami The Interview: From Neutral Stance to Political Involvement - Andrea Fontana and James Frey Rethinking Observation: From Method to Context - Michael Agrosino et al. Notes on (Field) notes - James Clifford The Textual Approach: Risk and Blame in Disaster Sensemaking - Robert Gephart Triangulation in Organizational Research: A Re-presentation - Julie Wolfram Cox and John Hassard The Storytelling Organization: A Study of Performance in an Office Supply Firm - David Boje Semiotics and the Study of Occupational and Organizational Cultures - Stephen Barley The Use of Grounded Theory for the Qualitative Analysis of Organizational Behaviour - Barry Turner Reflecting on the Strategic Use of CAQDAS to Manage and Report on the Qualitative Research Process - Mark Wickham and Megan Woods Longitudinal Field Research on Change - Andrew Pettigrew Historical Perspectives in Organization Studies: Factual Narrative and Archeo-Genealogical - Michael Rowlinson Action Research: Explaining the Diversity - Cathy Cassell and Phil Johnson Photography and Voice in Critical Qualitative Management Research - Samantha Warren Moments Mixed Methods and Paradigm Dialogues - Norman Denzin VOLUME THREE: PRACTICES AND PREOCCUPATIONS Extract from The Discipline and Practice of Qualitative Research - Norman Denzin and Yvonna Lincoln Learning to Be a Qualitative Management Researcher - Catherine Cassell et al. Getting In Getting On Getting Out and Getting Back - David Buchanan et al. Reflections on the Researcher-Researched Relationship: A Woman Interviewing Men - Terry Arendell Real-Time Reflexivity: Prods to Reflection - Karl Weick Towards an Integrative Reflexivity in Organizational Research - Leah Tomkins and Virginia Eatough Appealing Work: An Investigation of How Ethnographic Texts Convince - Karen Golden-Biddle and Karen Locke The Philosophy and Politics of Quality in Qualitative Organizational Research - John Amis and Michael Silk Objectivity and Reliability in Qualitative Analysis: Realist Contextualist and Radical Constructionist Epistemologies - Anna Madill et al. Whatever Happened to Organizational Ethnography: A Review of the Field of Organizational Ethnography and Anthropological Studies - S.P. Bate Working with Pluralism: Determining Quality in Qualitative Research - Mark Easterby-Smith, Karen Golden-Biddle and Karen Locke The Role of the Researcher: An Analysis of Narrative Position in Organisation Theory - Mary Jo Hatch The Professional Apprentice: Observations of Fieldwork Roles in Two Organizational Settings - John Van Maanen and Deborah Kolb In Defense of Being "Native": The Case for Insider Academic Research - Teresa Brannick and David Coghlan Ethics and Ethnography - Robert Dingwall Extract from Qualitative Methods in Management Research - Evert Gummesson Making Sense as a Personal Process - Judi Marshall My Affair with the "Other": Identity Journeys across the Research-Practice Divide - Laura Empson VOLUME FOUR: CHALLENGES AND PROSPECTS Secrecy and Disclosure in Fieldwork - Richard Mitchell Organization Science as Social Construction: Postmodern Potentials - Kenneth Gergen and Tojo Joseph Thatchenkerry Farewell to Criteriology - Thomas Schwandt Reflexive Inquiry in Organizational Research: Questions and Possibilities - Ann Cunliffe The Action Turn: Towards a Transformational Social Science - Peter Reason and William Torbert Signing My Life Away? Researching Sex and Organization - Joanna Brewis Evaluating Qualitative Management Research: Towards a Contingent Criteriology - Phil Johnson et al. Postcolonialism and the Politics of Qualitative Research in International Business - Gavin Jack and Robert Westwood Organization Studies and Epistemic Coloniality in Latin America: Thinking Otherness from the Margins - Eduardo Ibbaro-Colado Fitting Oval Pegs into Round Holes: Tensions in Evaluating and Publishing Qualitative Research in Top-Tier North American Journals - Michael Pratt Hegemonic Academic Practices: Experiences of Publishing from the Periphery - Susan Merilainen et al., Case Study as Disciplinary Convention: Evidence from International Business Journals - Rebecca Piekkari, Catherine Welsh and Eriikka Paavilainen Managerialism and Management Research: Would Melville Dalton Get a Job Today? - Emma Bell Ways of constructing research questions: gap-spotting or problematization? - Jorgen Sandberg and Mats Alvesson

Challenges and prospects

https://par.nsf.gov/servlets/purl/10186325

Promising properties and future trend of eutectic high entropy alloys

Multicomponent high-entropy Cantor alloys

High-entropy alloys with heterogeneous microstructure: Processing and mechanical properties

A new CrFeNi2Al eutectic high entropy alloy system with excellent mechanical properties

A novel Fe20Co20Ni41Al19 eutectic high entropy alloy with excellent tensile properties

High-entropy alloys have attracted much attention due to their unique microstructures and excellent properties. Since their invention more than ten years ago, research attention has been mainly focused on the study of multicomponent alloys with equiatomic or near-equiatomic compositions. Here we propose a novel design of non-equiatomic medium-entropy alloys that contain one matrix element and several equiatomic alloying elements. To verify the utility of this new design, a series of Co-free Fex(CrNiAl)100−x (at.%, 25 ≤ x ≤ 65) medium-entropy alloys were designed from the much-studied FeNiCrCoAl high-entropy alloy. Detailed characterization reveals that the alloys exhibit novel two-phase microstructures consisting of B2-ordered nanoprecipitates and BCC-disordered matrix. As the alloys deviate far from equiatomic composition, the structure of the nanoprecipitates transfers from a spinodal-like intertwined structure to a nanoparticle dispersed structure. Previous parametric approaches to predict phase formation rules for high-entropy alloys are unable to describe the phase separation behaviors in the studied alloys. Our findings provide a new route to design medium-entropy alloys and also demonstrate a strategy for designing nanostructured alloys from multicomponent alloy systems through simple variations in non-equiatomic compositions.

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Xingyu Du

Papers

A new CrFeNi2Al eutectic high entropy alloy system with excellent mechanical properties

A novel Fe20Co20Ni41Al19 eutectic high entropy alloy with excellent tensile properties

Design of non-equiatomic medium-entropy alloys.

A new pseudo binary strategy to design eutectic high entropy alloys using mixing enthalpy and valence electron concentration

The microstructure and high-temperature properties of novel nano precipitation-hardened face centered cubic high-entropy superalloys