Sn-Cu-Sb3元系合金(ピューター)の金相学と機械的性質  [in Japanese] Metallography and Mechanical Properties of Sn-Cu-Sb (Pewter) Ternary Alloys  [in Japanese]

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Abstract

スズを基としたスズ-銅-アンチモン合金は一般にホワイトメタルと呼ばれ,工業用軸受け材料やピューターと呼ばれる工芸材料に多く利用されている。本実験では工芸材料の立場から金相学および機械的性質について実験と検討を行った。得られた結果は次の通りである ; (1)Sn-CuおよびSn-Sb 2元系合金の冷却過程において熱分析曲線の上で2種類の発熱ピークが観察された。一方,Sn-Cu-Sb 3元系合金では3種類のピークが観察された。これら3種類の合金の60OK付近で現われる第1ピークは平衡状態図中の液相線上の点に相当する。約500Kで現われる第2ピークは,それぞれSn-Cu系ではa/α+η,Sn-Sb系ではα/α+β. Sn-Cu-Sb系ではα+γ/α+β+γの変態温度に相当する。Sn-Cu-Sb 3元合金だけは520K付近で第3のピークが観察された。これは平衡状態図中の固相線温度に相当する。(2)5mass% CuまでのSnへの参加による硬さへの影響はほとんど認められなかった。しかしながら、SnへのSbの添加は硬さを著しく向上させた。SnへのCuとSbの同時添加は3元系合金の硬さを効果的に高めた。(3)本3元系合金の強化機構は時効硬化型であると考えられる。

Tin base-Cu-Sn ternary alloy is generally used for both industrial bearing materials, called White metal, and arts and craft material, called Pewter. In the preseut experiment, metallography and some mechanical properties of this alloy system were examined on the basis of materials for arts and crafts. The results obtained were as follows ; (1) Two kinds of exothermic peaks on thermal anasysis curves were observed in the cooling process for the sopecimens of Sn-Cu and Sn-Sb binary alloys. 0n the other hand, three kinds of exothermic peaks were observed for the specimen of Sn-Cu-Sb ternary alloy. The first peaks appeared at around 600K for these three kinds of specimens corresponding to the points of solidus lines on the equlibrium phase diagrams. The second peaks appeared at around 500K corresponding to the transus points of α/α+η for Sn-Cu, a/a+β for Sn-Sb and α+γ/α+β+γ for Sn-Cu-Sb alloys, respectively. Only for the Sn-Cu-Sb ternary alloy, was a third peak observed at a temperature of around 520K, corresponding to the solidus point in the equilibrium phase diagram. (2) Influence of the Cu addition of up to 5mass% to Sn on the hardness was hardly recognized. However, Sb addition to Sn enhanced the hardness remarkably. Addition of both Cu and Sb to Sn effectively enhanced the hardness of the Sn-Cu-Sb ternary alloys. (3) The cause of the ternary alloys strengthening is thought to be related to the hardening of methl during the annealing process.

Journal

  • Bulletin of Takaoka National College

    Bulletin of Takaoka National College (5), 19-26, 1994

    University of Toyama

Codes

  • NII Article ID (NAID)
    110000955853
  • NII NACSIS-CAT ID (NCID)
    AN10284910
  • Text Lang
    JPN
  • Article Type
    departmental bulletin paper
  • ISSN
    0915-7387
  • Data Source
    NII-ELS  IR 
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