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Abstract <p>In the present study, the specific heat capacity of solid magnesium–lithium alloys with composition of 5, 10, and 17 at % lithium in the temperature range of 185 to 755–780 K was measured for the first time. Measurements were performed by the method of differential scanning calorimetry using a DSC 404 F1 apparatus. The estimated uncertainty of the data obtained was 2–3%. The temperature dependences were developed and the table of recommended values on their basis were presented for use in various scientific and practical tasks. It has been established that the specific molar heat capacity data of the magnesium–lithium alloys containing 5–17 at % lithium practically coincide with each other over a wide temperature range and can be estimated within the measurement uncertainty limits using the heat capacity temperature dependence of solid magnesium. It is possible to estimate the heat capacity of the studied alloys (with an accuracy not exceeding the measurement uncertainty) up to the melting point of lithium (456 K) using the Neumann–Kopp rule; however, such an estimation can be carried out in a much narrower temperature range than the previous one.</p>

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Heat Capacity of Magnesium–Lithium Alloys with 5–17 at % Li

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • D. A. Samoshkin,
  • R. N. Abdullaev,
  • A. Sh. Agazhanov,
  • S. V. Stankus

摘要

Abstract

In the present study, the specific heat capacity of solid magnesium–lithium alloys with composition of 5, 10, and 17 at % lithium in the temperature range of 185 to 755–780 K was measured for the first time. Measurements were performed by the method of differential scanning calorimetry using a DSC 404 F1 apparatus. The estimated uncertainty of the data obtained was 2–3%. The temperature dependences were developed and the table of recommended values on their basis were presented for use in various scientific and practical tasks. It has been established that the specific molar heat capacity data of the magnesium–lithium alloys containing 5–17 at % lithium practically coincide with each other over a wide temperature range and can be estimated within the measurement uncertainty limits using the heat capacity temperature dependence of solid magnesium. It is possible to estimate the heat capacity of the studied alloys (with an accuracy not exceeding the measurement uncertainty) up to the melting point of lithium (456 K) using the Neumann–Kopp rule; however, such an estimation can be carried out in a much narrower temperature range than the previous one.