Structure and properties of rapidly solidified Al-6-8 mass%Mn-1-3 mass%Cr alloys.
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- KIMURA Norihito
- Graduate Student, Nihon University [Present: NKK Corp.]
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- KANEKO Junichi
- Department of Mechanical Engineering, College of Industrial Technology, Nihon University
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- SUGAMATA Makoto
- Department of Mechanical Engineering, College of Industrial Technology, Nihon University
Bibliographic Information
- Other Title
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- 急冷凝固法によるAl‐6~8%Mn‐1~3%Cr合金の組織と性質
- 急冷凝固法によるAl-6~8%Mn-1~3%Cr合金の組織と性質
- キュウレイ ギョウコホウ ニ ヨル Al 6 8パーセント Mn 1 3パーセント Cr ゴウキン ノ ソシキ ト セイシツ
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Description
In order to assess the optimum alloying composition, rapidly solidified P/M materials were prepared for Al–Mn–Cr ternary alloys containing 6∼8 mass%Mn and 1∼3 mass%Cr. Effects of alloying composition on precipitation hardening were studied with a purpose of obtaining precipitation-hardened materials with some acceptable ductility. The critical composition to observe precipitation hardening was identified as 8.8 mass%Mn + Cr, above which hardening increased with increasing Mn + Cr. The largest hardening was observed for 7Mn–3Cr alloy containing highest Mn + Cr. CrAl7 was formed in as rapidly solidified state, and precipitation of MnAl6 occurred during hot extrusion in alloys of lower Cr content. Finally, G phase, (Mn, Cr) Al12 was formed during heating of hot-extruded materials, thereby hardening occurred when amount of G phase formation is sufficiently large. For the as-extruded P/M materials, the highest tensile strength of 480 MPa was obtained at room temperature for 7Mn–3Cr with 7% elongation. Elongation of the as-extruded P/M materials kept unchanged up to 473 K but increased appreciably at 673 K. However, the heat-treated P/M materials showed poor ductility and hence tensile strength decreased with aging time regardless of occurrence of hardening. Increases in elastic modulus were observed after precipitation heat treatment.
Journal
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- Journal of Japan Institute of Light Metals
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Journal of Japan Institute of Light Metals 50 (1), 12-17, 2000
The Japan Institute of Light Metals
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Details 詳細情報について
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- CRID
- 1390001206336568192
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- NII Article ID
- 10004548393
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- NII Book ID
- AN00069773
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- COI
- 1:CAS:528:DC%2BD3cXhvVymtbo%3D
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- ISSN
- 18808018
- 04515994
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- NDL BIB ID
- 4971129
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed