Table 1.

Material used in this study with the purity given in wt.% and ppm, otherwise carbon concentration and impurity elements in ppm.

Material	Ni (wt.%)	Total impurity content (ppm)	Carbon content (ppm)	Impurity elements (ppm)
Ni99.99	99.996	41	8	Al(2.9), Ca(<1), Co(1.9), Cr(2.065), Cu(2), Fe(12.15), Ir(0.32), Mo(0.48), Nb(0.1), Re(0.23), Sb(0.3), Si(0.17), Ta(<1), V(8.1)
Ni–300ppmC	99.972	283	250
Ni–600ppmC	99.950	518	485
Ni–1200ppmC	99.880	1.200	1167
Ni99.79	99.789	2.110	600	Cu(<100), Fe(<100), Mn(1100), S(10), Si(200)
Ni99.69	99.687	3.130	100	Co(300), Cu(1600), Fe(400), Mn(300), P(200), S(<30), Si(200)