Spontaneous formation of sub-4 nm nanocrystalline alloy via polymorphic phase transformation

Ying Zhong; Chunqing Wang; Jin Wang; Huiwen Ma; Sriram Krishnamoorthy; Vladislav Paley; Zijian Weng; Sungho Jin

doi:10.1080/21663831.2020.1791272

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Spontaneous formation of sub-4 nm nanocrystalline alloy via polymorphic phase transformation

Original Reports | 更新时间：2026-08-19

- Spontaneous formation of sub-4 nm nanocrystalline alloy via polymorphic phase transformation
- Materials Research Letters Vol. 8, Issue 11, Pages: 431-437(2020)
- 作者机构：
  
  1. a Department of Mechanical Engineering University of South Florida Tampa FL USA
  2. b State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin People’s Republic of China
  3. b State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology
  4. a Department of Mechanical Engineering University of South Florida Tampa
  5. c Department of Mechanical and Aerospace Engineering University of California at San Diego La Jolla
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2020.1791272
  CLC：
- Online First：10 July 2020，
  
  Published：2020
- 稿件说明：
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Ying Zhong, Chunqing Wang, Jin Wang, et al. Spontaneous formation of sub-4 nm nanocrystalline alloy via polymorphic phase transformation[J]. Materials Research Letters, 2020, 8(11): 431-437.
DOI：

Ying Zhong, Chunqing Wang, Jin Wang, et al. Spontaneous formation of sub-4 nm nanocrystalline alloy via polymorphic phase transformation[J]. Materials Research Letters, 2020, 8(11): 431-437. DOI： 10.1080/21663831.2020.1791272.

摘要

Abstract

new phase-transformation-induced path to spontaneous formation of extreme nanograin structure is reported.

In-situ-heating-mode-

microscopy exhibited a substantial grain-growth of Cu

. During cooling

the grain-growth continued

but it spontaneously switched to grain-refinement mode on phase transformation through ∼180 °C from

-Cu

η’

-Cu

ending up with an extremely small nanograin size of ∼2.5 nm. The cooling cycling always restores the nanograin size regardless of thermal exposure history

making this to be the first demonstration to

stabilize

the nanograin with its own spontaneous behavior. The Young’s Modulus was significantly reduced by ∼×3

and the elongation was remarkably increased by ∼×8 to ∼9%.

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Related Institution

a State Key Laboratory of Solidification Processing Northwestern Polytechnical University

a State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an People’s Republic of China

b Chongqing Innovation Center Northwestern Polytechnical University

c Shaanxi Key Laboratory of Electrical Materials and Infiltration Technology School of Materials Science and Engineering Xi'an University of Technology

a Key Laboratory of Multifunctional Nanomaterials and Smart Systems Division of Advanced Materials Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou People’s Republic of China

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