Journal
MATERIALS TRANSACTIONS
Volume 60, Issue 9, Pages 1914-1920Publisher
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.MT-M2019145
Keywords
hetero structure; strength and ductility; shell; core; strain hardening rate; strain hardening exponent
Funding
- JSPS [JP18H05256]
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This study aimed at investigating the influence of microstructure on mechanical properties of Harmonic Structured (HS) pure-Ni compacts. The harmonic structure is a heterogeneous microstructure with a spatial distribution of fine grains (FG) and coarse grains (CG), that is, the CG areas ('Core') embedded in the matrix of three-dimensionally continuously connected network of FG areas ('Shell'). The HS pure-Ni samples were fabricated by powder metallurgy route consisting of mechanical milling (MM) of plasma rotated electrode processed pure-Ni powder and subsequent sintering by Spark Plasma Sintering. The plastic deformation at powder particle surface increases with increasing MM time. As a result, after sintering, shell fraction also increases in the HS pure-Ni samples. It was found that the fraction of a shell area is an important parameter controlling the balance of the mechanical properties of the HS pure-Ni compacts. The HS pure-Ni with a higher fraction of shell area demonstrated higher strength and approximately similar elongation as compared to the homo Ni samples and HS pure-Ni samples containing low shell fraction. Moreover, the effects of strain hardening rates and strain hardening exponents on deformation behaviour of HS pure-Ni samples were also discussed.
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