Abstract
The ability to tune the degree of L21 order is of utmost importance for the magneto-mechanical properties of Ni-Mn-based Heusler alloys, e.g., the appearance of a martensitic phase in the Ni2MnAl system. Here, differential scanning calorimetry is established as a convenient tool for determining the state of order by way of its effect on the magnetic transition temperature, and it is used for studying the low-temperature ordering kinetics in Ni2MnAl. A significant acceleration of ordering kinetics due to excess vacancies retained after high-temperature quenching is demonstrated. Using this effect, equilibrium of order could be attained at temperatures as low as 623 K, where ordering under equilibrium vacancy concentration would take unpractically long.
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