A CALORIMETRIC STUDY OF PRECIPITATION IN AN AL-CU ALLOY WITH SILICON PARTICLES

被引:34
|
作者
STARINK, MJ
VANMOURIK, P
机构
[1] Laboratory of Metallurgy, Delft University of Technology, Delft, 2628 AL
关键词
D O I
10.1007/BF02670289
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The precipitation of copper and silicon from the Al-rich matrix in an Al-1.3 at. pct Cu-19.1 at. pct Si alloy was investigated by differential scanning calorimetry (DSC). Both as-extruded (AE) and extruded and solution treated and quenched (solid-quenched, SQ) specimens were studied. The DSC curves of the SQ specimens showed two exothermic effects, A and B. Effect A corresponded to the simultaneous precipitation of silicon and copper, whereas effect B was caused by the transition from the state with the intermediate copper-containing phase, theta', to the state with the equilibrium copper-containing phase, theta. The heat contents of effect A and B could quantitatively be described in terms of solid solubilities before and after precipitation and the heats of precipitation of the phases involved. From this description, it was derived that for heating rates less-than-or-equal-to 20 K/min, copper precipitated as the theta' phase, while for heating rates greater-than-or-equal-to 40 K/min, copper precipitated mainly as the theta phase. In SQ specimens, Guinier-Preston (GP)-zone formation occurred during aging at room temperature with a rate approximately 10(4) times slower than in the corresponding binary Al-Cu alloy. For the AE specimens, it was found that during extrusion, precipitation of copper and silicon proceeded to a large extent. However, from DSC experiments and from hardness measurements as a function of aging time at 453 K, it was deduced that copper precipitation had not finished during extrusion. The hardness increase as observed during aging directly after extrusion was interpreted to be due to formation of the semicoherent intermediate theta' phase.
引用
收藏
页码:665 / 674
页数:10
相关论文
共 50 条
  • [31] Characterization of an Al-Cu cast alloy
    Talamantes-Silva, M. A.
    Rodriguez, A.
    Talamantes-Silva, J.
    Valtierra, S.
    Colas, Rafael
    MATERIALS CHARACTERIZATION, 2008, 59 (10) : 1434 - 1439
  • [32] Welding of Al-Cu series alloy
    Okita, Tomiharu
    Keikinzoku Yosetsu/Journal of Light Metal Welding and Construction, 1995, 33 (02):
  • [33] AL-CU ALLOY FOR GAS PANELS
    BRUSIC, V
    DHEURLE, FM
    MACINNES, RD
    ALESSANDRINI, EI
    ANGILELLO, J
    DEMPSEY, JJ
    SAMPOGNA, M
    IBM JOURNAL OF RESEARCH AND DEVELOPMENT, 1978, 22 (06) : 647 - 657
  • [34] INTERNAL FRICTION IN AL-CU ALLOY
    QUADER, MA
    JOURNAL OF APPLIED PHYSICS, 1962, 33 (06) : 1922 - &
  • [35] The effects of temperature on wear behaviours of Al-Cu alloy and Al-Cu/SiC composite
    Muratoglu, M
    Aksoy, M
    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2000, 282 (1-2): : 91 - 99
  • [36] The influence of Mn on precipitation behavior in Al-Cu
    Takeda, M
    Komatsu, A
    Ohta, M
    Shirai, T
    Endo, T
    SCRIPTA MATERIALIA, 1998, 39 (09) : 1295 - 1300
  • [37] PRECIPITATION EFFECTS ON THERMOPOWER IN AL-CU ALLOYS
    PELLETIER, JM
    VIGIER, G
    MERLIN, J
    MERLE, P
    FOUQUET, F
    BORRELLY, R
    ACTA METALLURGICA, 1984, 32 (07): : 1069 - 1078
  • [38] DISCONTINUOUS PRECIPITATION IN DEFORMED AL-CU ALLOYS
    BARRAND, P
    TOTTLE, CR
    DRIVER, D
    MITCHELL, AB
    ACTA METALLURGICA, 1967, 15 (09): : 1553 - &
  • [39] A CALORIMETRIC STUDY OF PRECIPITATION PROCESS IN AL-LI-MG ALLOY
    JO, HH
    OHSHIMA, T
    HIRANO, K
    THERMOCHIMICA ACTA, 1985, 92 (SEP) : 309 - 312
  • [40] A high temperature nanoindentation study of Al-Cu wrought alloy
    Koch, Susanne
    Abad, Manuel D.
    Renhart, Susanna
    Antrekowitsch, Helmut
    Hosemann, Peter
    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2015, 644 : 218 - 224