Decomposition of High Temperature γ<SUB>Mn</SUB> Phase during Continuous Cooling and Resultant Damping Behavior in Mn<SUB>74.8</SUB>Cu<SUB>19.2</SUB>Ni<SUB>4.0</SUB>Fe<SUB>2.0</SUB> and Mn<SUB>72.4</SUB>Cu<SUB>20.0</SUB>Ni<SUB>5.6</SUB>Fe<SUB>2.0</SUB> Alloys
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- Yin Fuxing
- National Research Institute for Metals
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- Ohsawa Yoshiaki
- National Research Institute for Metals
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- Sato Akira
- National Research Institute for Metals
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- Kawahara Kohji
- B. B. Materia Co. Ltd.
Bibliographic Information
- Other Title
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- Decomposition of High Temperature γMn Phase during Continuous Cooling and Resultant Damping Behavior in Mn74.8Cu19.2Ni4.0Fe2.0 and Mn72.4Cu20.0Ni5.6Fe2.0 Alloys
- Decomposition of High Temperature ガンマ M
- Decomposition of High Temperature γ<SUB>Mn</SUB> Phase during Continuous Cooling and Resultant Damping Behavior in Mn<SUB>74.8</SUB>Cu<SUB>19.2</SUB>Ni<SUB>4.0</SUB>Fe<SUB>2.0</SUB> and Mn<SUB>72.4</SUB>Cu<SUB>20.0</SUB>Ni<SUB>5.6</SUB>Fe<SUB>2.0</SUB> Alloys
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Abstract
The temperature dependent changes of logarithmic decrement δ and Young’s modulus E were measured for continuously cooled Mn74.8Cu19.2Ni4.0Fe2.0 and Mn72.4Cu20.0Ni5.6Fe2.0 (at%) alloys, after solid solution holding at 1173 K. Microstructure of those alloys, cooled to room temperature in different rates, was characterized by X-ray diffraction and electron microscopy. Ni apparently inhibited the decomposition of high temperature γMn phase during cooling, so lower fcc-fct transformation temperatures (Tt) were observed in Mn72.4Cu20.0Ni5.6Fe2.0 alloy. Besides, several fct phases with different lattice parameters or Tt temperatures, i.e. an appearance of compositional heterogeneity in the Mn-enriched fraction, were also manifested in the alloy with Ni of 5.6 at%. Large amounts of (011) twinning plates were observed as a typical feature in the microstructure of Mn74.8Cu19.2Ni4.0Fe2.0 alloy. However, tetragonal distortion caused mis-fitting at the twinning boundaries resulted in a rapid reduction of logarithmic decrement in the vicinity of 273 K. Meanwhile, a larger amount of precipitated Cu-enriched phase confined the formation and growth of twinning plates in the fct phases, and hence reduced logarithmic decrements. In contrast, a tweed microstructure in Mn72.4Cu20.0Ni5.6Fe2.0 alloy sustained the high damping capacity in a wide temperature range near 273 K, irrespective of the cooling rates.
Journal
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- Materials Transactions, JIM
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Materials Transactions, JIM 39 (8), 841-848, 1998
The Japan Institute of Metals
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Details 詳細情報について
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- CRID
- 1390282679223421568
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- NII Article ID
- 130003557068
- 10003803499
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- NII Book ID
- AA10699969
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- COI
- 1:CAS:528:DyaK1cXms1Ont7k%3D
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- ISSN
- 2432471X
- 09161821
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- NDL BIB ID
- 4549325
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed