Erratum to: JOM, Vol. 69, No. 6, 2017, DOI: 10.1007/s11837-017-2336-4

Equation 6 appeared incorrectly in the original version of this article. It is corrected below (Eq. 6):

$$ M_{\exp .} = \sqrt {\left[ {\left( {\frac{{P_{\text{exit}} }}{{P_{{{\text{metal}} .}} }}} \right)^{{{\raise0.7ex\hbox{${\left( {k - 1} \right)}$} \!\mathord{\left/ {\vphantom {{\left( {k - 1} \right)} k}}\right.\kern-0pt} \!\lower0.7ex\hbox{$k$}}}} \left( {\frac{k + 1}{2}} \right) - 1} \right] \frac{2}{k - 1}} $$
(6)