YANG Liushuan
,
LIU Yongchang
,
YANG Gencang
,
ZHOU Yaohe(State Key Laboratory of Solidification Processing
,
Northwestern Polytechnic University
,
Xi'an
,
710072
,
China)
金属学报(英文版)
The elevated temperature creep properties(90-150℃) of high silicon(～6wt%Si) alloy ZA27 prepared by spray deposition have been investigated by means of ball hardness testing method.The results indicate that the creep properties of the material prepared by spray deposition are notably improved,compared to that of the conventional casting alloy ZA27.The creep activation energy of the spray deposited alloy ZA27 is 3.9-5.7 kJ/mol higher than that of the conventional casting alloy ZA27.The creep formulation in this experiment is also derived as follows:HB-2-HB0-2=K exp(- Q/3RT)(t1/3-t01/3)The reasons for the improvement of creep resistance are also discussed from a microstructural point of view.
关键词:
:spray deposition
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CUI Chengsong
,
FAN Hongbo
,
SHEN Jun
,
JIANG Zuling
,
LI Qingchun(Department of Metallic Materials and Technology
,
Harbin Institute of Technology
,
Harbin 150001
,
China) Manuscript received 26 May 1995
金属学报(英文版)
Al-3.8Li-0.8Mg-0.4Cu-0.13Zr alloy was prepared by a novel spray deposition technique,and its microstructure and tensile properties after various aging treatments have been investigated. The experimental results show that the alloy,under study has very fine equiaxed grains about 5-20μm in diameter and a relative density of(94±3)% on average.Grains in the as-extruded alloy are"brick-like"in morphology,and few oxide particles have been found al the grain boundaries.δ' particles with irregular shape and"δ'-β'"coprecipitates appear in the aged alloy.The coarsening of δ'particles is fast,and the distance between the particles does not widen so obviously as that of IM(ingot-casting method) alloys with increasing aging time.The spray deposited Al-Li alloy.reaches the peak-aged condition in a short time(10 h al 190℃) when the best properties(σb=534 MPa, σ0.2=480 MPa.δ=10%) are obtained.Compared with RSPM(rapid solidification processing method)Al-Li alloy,the ductility of the tested alloy has been obviously.enhanced while a comparable tensile strength is maintained.
关键词:
:spray deposition
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