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2016 ; 6
(ä): 33228
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Ultra-strong and damage tolerant metallic bulk materials: A lesson from
nanostructured pearlitic steel wires
#MMPMID27624220
Hohenwarter A
; Völker B
; Kapp MW
; Li Y
; Goto S
; Raabe D
; Pippan R
Sci Rep
2016[Sep]; 6
(ä): 33228
PMID27624220
show ga
Structural materials used for safety critical applications require high strength
and simultaneously high resistance against crack growth, referred to as damage
tolerance. However, the two properties typically exclude each other and research
efforts towards ever stronger materials are hampered by drastic loss of fracture
resistance. Therefore, future development of novel ultra-strong bulk materials
requires a fundamental understanding of the toughness determining mechanisms. As
model material we use today's strongest metallic bulk material, namely, a
nanostructured pearlitic steel wire, and measured the fracture toughness on
micron-sized specimens in different crack growth directions and found an
unexpected strong anisotropy in the fracture resistance. Along the wire axis the
material reveals ultra-high strength combined with so far unprecedented damage
tolerance. We attribute this excellent property combination to the anisotropy in
the fracture toughness inducing a high propensity for micro-crack formation
parallel to the wire axis. This effect causes a local crack tip stress relaxation
and enables the high fracture toughness without being detrimental to the
material's strength.