Preparation of Amorphous High Nitrogen Iron Alloys with Ternary Additions by Mechanical Alloying

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概要

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• In order to prepare amorphous high nitrogen iron alloys, mechanical alloying (MA) of elemental powder mixtures with Fe-9.85mass%N alloy powder of Fe<SUB>(100-<I>y</I>)-<I>x</I></SUB>A<SUB><I>y</I></SUB>N<SUB><I>x</I></SUB>(at%) (A=Mn, Cr, Mo, W, V, Nb, Ta, Co or Ni; <I>x</I>=0-20; <I>y</I>=0-25) was performed in an argon atmosphere using a planetary ball mill. Effect of the ternary additives A on MA of the Fe-N materials was investigated in terms of the interaction parameter <I>W</I><SUB>AN</SUB> of the additives A. The interaction parameters <I>W</I><SUB>AN</SUB> represents the difference in bonding energy of A-N atomic pair (<I>U</I><SUB>AN</SUB>) and that of Fe-N pair (<I>U</I><SUB>FeN</SUB>) in the ternary Fe-A-N solution, <I>i.e</I>. <I>W</I><SUB>AN</SUB>=<I>U</I><SUB>AN</SUB>-<I>U</I><SUB>FeN</SUB>, and the values of <I>W</I><SUB>AN</SUB> are calculated using thermodynamic data at 1273 K on austenite. The value of <I>W</I><SUB>AN</SUB> is clearly dependent on the position of the elements A in the periodic table and a similar tendency in the dependencies exists in any liquid or solid solutions of Fe-A-N. Thus, this is also expected to hold for Fe-A-N materials peocessed by MA. <Br>In the MA processing, the ternary additives A with a moderately negative <I>W</I><SUB>AN</SUB> value of -330 to -980kJ/mol, such as Cr, Nb and Ta, markedly promote solid-state reactions, leading to formation of amorphous high nitrogen iron alloys having <I>x</I>=8.5-20 after 720 ks of processing by adding about 13-15 at% of these additives to Fe-N materials, in contrast to the additives Co and Ni with the positive <I>W</I><SUB>AN</SUB> value. However, for the MA sample with the additive Ti, the formation of TiN was seen during MA, before progress of the intermixing of atomic species due to its extremely negative <I>W</I><SUB>AN</SUB> value (-4110 kJ/mol). In addition, the additive Mn with the less negative value of <I>W</I><SUB>AN</SUB> (-104 kJ/mol) did noteffectively act on MA of Fe-N materials. Similar effects of such additive were also obtained in MA materials with austenitic stainless steel compositions.

• 社団法人 日本鉄鋼協会の論文
• 1996-07-15

著者

• Ogawa Hidenori

  College Of Industrial Technology

• MIURA Harumatsu

  College of Industrial Technology

• OMURO Keisuke

  College of Industrial Technology

関連論文

• Amorphization of Interstitial Elements Containing Iron Materials by Mechanical Alloying
• Composition Dependence of Microstructure of Mechanically Alloyed Powders and Their Compacts of High Nitrogen Cr-Mn Steels
• Preparation of Amorphous High Nitrogen Iron Alloys with Ternary Additions by Mechanical Alloying
• Preparation of Nanocrystalline High-Nitrogen Stainless Steel Powders by Mechanical Alloying and Their Hot Compaction

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