Microstructure, Mechanical and Corrosion Properties of AlCoCrFeNi High-Entropy Alloy Prepared by Spa

来源 :金属学报(英文版) | 被引量 : 0次 | 上传用户:mlgb7758521
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
AlCoCrFeNi is one of the most widely studied alloy systems in the high-entropy alloy (HEA) area due to the interesting microstructure and mechanical properties.In this study,the A1CoCrFeNi alloy was prepared using spark plasma sintering (SPS) with pre-alloy powders obtained through gas atomization.Then,the sintered samples were annealed at 700,800 and 900 ℃,and the effect of annealing temperature on the microstructure,mechanical and corrosion properties was studied.The results show that phase formation takes place during annealing process with the new phase (σ) and some nanoscale BCC precipitates formation.The size and quantity of the nanoscale precipitates increase with increasing annealing temperature.The twin is also observed after annealing at 900 ℃.The annealing temperature has an obvious effect on the mechanical properties and corrosion resistance of the spark plasma sintered AlCoCrFeNi HEA.When the annealing temperature is 700 ℃,the hardness,yield strength and fracture strength reach the maximum with the value of 545 HV,1430 MPa and 2230 MPa,respectively.The compressive ratio reaches the maximum of 17.2%,with the annealing temperature increasing to 800 ℃.The corrosion resistance of the samples decreases with increasing the annealing temperature.
其他文献
Titanium alloy Ti-Al-Nb-Zr has high specific strength and becomes a promising structural material used in the deep sea.The excellent corrosion resistance of the alloy is derived from the protective passive film formed on its surface.By now,full agreement
Cu pillar bump offers a number of advantages for flip chip packaging,compared to the conventional solder bump.However,due to its rigidity structure,Cu pillar bump introduces a lot of stress to the chip,which causes the failure of packaging structures,espe
Microalloying is an effective method to improve the comprehensive properties of copper alloys.The effects of magnesium on the microstructure,mechanical properties and anti-stress relaxation properties of CuNiSi alloys have been investigated.Results demons
Structural metallic materials with excellent functional performance and lightweight features have always been the goal of material scientists\' pursuit.In this work,laminated metal composites of different thicknesses (less than 0.4 mm) composed of struc
Friction stir lap welding was conducted on 2 mm + 2 mm sheets of aluminum alloy 2A12-T4.The plunge depth (PLD) was designed as 2.45-2.58 mm,which was varied in submillimeters as 2.45,2.50,2.53,2.55,and 2.58 mm,and the axial force was recorded in the weldi
The effects of tempering temperatures on the microstructure and mechanical properties of the simulated coarse-grain heataffected zone (CGHAZ) and inter-critical heat-affected zone (ICHAZ) were investigated for a high-strength-high-toughness combination ma
Amorphous Al2O3-reinforced Al composite (am-Al2O3/Al) compacted from ultrafine Al powders for high-temperature usages confronts with drawbacks because crystallization of am-Al2O3 at high temperatures will result in serious strength loss.Aiming at this uns
A new Mg-2.2 wt% Zn alloy containing 1.8 wt% Ca and 0.5 wt% Mn has been developed and subjected to extrusion under different extrusion parameters.The finest (~ 0.48 μm) recrystallized grain structures,containing both nano-sized MgZn2 precipitates and αt-M
At room temperature,crystalline Mg-based alloys,including Mg2Ni,MgNi,REMg12 and La2Mg17,have been proved with weak electrochemical hydrogen storage performances.For improving their electrochemical property,the Mg is partially substituted by Ce in Mg-Ni-ba
In order to study the corrosion resistance of extruded magnesium alloys,the Mg-4Zn-2Gd-0.5Ca alloy was extruded at the speed of 0.01-0.1 mm/s with the temperature of 280-360 ℃ in present study.Hot extrusion results show that the volume fraction of precipi