Abstract
ABSTRACTHeterostructured materials have been reported as a new class of materials with superior mechanical properties, which was attributed to the development of back stress. There are numerous reports on back stress theories and measurements with no consensus. Back stress is developed in soft domains to offset the applied stress, making them appear stronger, while forward stress is developed to make hard domains appear weaker. The extra hardening in heterostructured materials is resulted from interactions between back stresses and forward stresses, and should be described as hetero-deformation induced (HDI) hardening and the measured ‘back stress’ should be renamed HDI stress.
Highlights
Heterostructured (HS) materials have recently attracted extensive attention from the materials community, as evidenced by the increasing number of international conferences and publications in recent years
A Gordon Research Conference on Heterostructured Materials will be held in June 2019
A symposium on Nanostructured, Heterostructured & Gradient Materials will be held in the Chinese Materials Conference in July 2019
Summary
Heterostructured (HS) materials have recently attracted extensive attention from the materials community, as evidenced by the increasing number of international conferences and publications in recent years. KEYWORDS Heterostructured materials; strain gradient; back-stress; forward stress; hetero-deformation induced (HDI) hardening In this elastic-plastic deformation stage, geometrically necessary dislocations (GNDs) will be blocked by and pile up against domain boundaries, which produces long-range internal stress, i.e. back stress, in the soft domain.
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