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Microhole Forming and Creep Behavior of Fe‐Based Nanocrystalline Alloys under Laser Dynamic Impact
Author(s) -
Liu Huixia,
Cui Jiankun,
Wang Lei,
Ma Youjuan,
Wang Xiao
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201901361
Subject(s) - materials science , creep , nanocrystalline material , fracture (geology) , composite material , brittleness , alloy , metallurgy , nanotechnology
Given the difficulty of forming Fe‐based nanocrystalline alloys at room temperature, this study uses soft film as a flexible micropunch to realize the formation of microholes in Fe‐based nanocrystalline alloy foil under laser impact. The effect of laser energy and soft film thickness on forming accuracy of the workpiece is studied, particularly fracture surface characteristic of the workpiece and the creep behavior of the workpiece. It is found that with increased laser energy, forming accuracy is improved. The fracture surface comprises sliding and fracture regions, and a large number of melt droplets and melt zone are distributed on the surface of the fracture region. This feature indicates that the workpiece exhibits brittle fracture in macroscopic scale and exhibits plastic fracture in the microscopic scale. The creep behavior of the workpiece comprises transient creep and steady state creep. With the extension of creep time, the stress exponent reaches a stable state. With the increase in load, the stress exponent also increases, which shows the obvious maximum load dependence.