TY - JOUR
T1 - Multistage devitrification of Mg-Ni-Mm and Mg-Ni-Y-Mm Metallic glasses (Mm = misch metal)
AU - Louzguine, Dmitri V.
AU - Louzguina, Larissa V.
AU - Inoue, Akihisa
PY - 2003/1/11
Y1 - 2003/1/11
N2 - Devitrification behaviour of Mg-Ni-Mm and Mg-Ni-Y-Mm metallic glasses (Mm = misch metal) was studied by differential scanning calorimetry, isothermal calorimetry, X-ray diffractometry and transmission electron microscopy. These materials exhibited a multistage devitrification with a primary exothermic peak with an onset temperature of about 450 K. Local atomic order changed during primary devitrification. This change occurs without an incubation period and leads to embrittlement of the samples. The activation energy value for the first exothermic heat effect in the Mg86Ni10Y 2Mm2 alloy is higher than the activation energy for Mg self-diffusion, implying that redistribution of the other alloying elements also takes place. The strongest heat effects are connected with the devitrification of the amorphous phase (changes in the local atomic order, precipitation of hcp Mg and the metastable compounds) while the magnitude of the heat effect of the transformation of metastable crystalline phases to stable phases in the Mg86Ni10Y2Mm2 alloy, for example, is 17 times weaker than the effect of devitrification of the amorphous phase. A continuous heating transformation diagram is derived from the results.
AB - Devitrification behaviour of Mg-Ni-Mm and Mg-Ni-Y-Mm metallic glasses (Mm = misch metal) was studied by differential scanning calorimetry, isothermal calorimetry, X-ray diffractometry and transmission electron microscopy. These materials exhibited a multistage devitrification with a primary exothermic peak with an onset temperature of about 450 K. Local atomic order changed during primary devitrification. This change occurs without an incubation period and leads to embrittlement of the samples. The activation energy value for the first exothermic heat effect in the Mg86Ni10Y 2Mm2 alloy is higher than the activation energy for Mg self-diffusion, implying that redistribution of the other alloying elements also takes place. The strongest heat effects are connected with the devitrification of the amorphous phase (changes in the local atomic order, precipitation of hcp Mg and the metastable compounds) while the magnitude of the heat effect of the transformation of metastable crystalline phases to stable phases in the Mg86Ni10Y2Mm2 alloy, for example, is 17 times weaker than the effect of devitrification of the amorphous phase. A continuous heating transformation diagram is derived from the results.
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U2 - 10.1080/0141861021000032687
DO - 10.1080/0141861021000032687
M3 - Article
AN - SCOPUS:0242334636
VL - 83
SP - 203
EP - 216
JO - Philosophical Magazine
JF - Philosophical Magazine
SN - 1478-6435
IS - 2
ER -