高温热处理对Al_xCoCrFeNi(0.5≤x≤0.8)高熵合金微观组织及力学性能的影响
Effect of high-temperature heat treatment on microstructure and mechanical properties of Al_xCoCrFeNi (0.5≤x≤0.8) high-entropy alloys
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文摘
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采用电弧熔炼法制备AlxCoCrFeN(i 0.5≤x≤0.8)高熵合金,研究1100 ℃高温热处理对合金微观组织和力学性能的影响。结果表明:铸态合金依次呈现为FCC枝晶组织(x=0.5和0.6)、类共晶组织(x=0.7)和BCC/B2枝晶组织(x= 0.8)。相应地,合金屈服强度和抗拉强度分别由291 MPa和733 MPa(x=0.5)提升至1004 MPa和1423 MPa(x=0.7),伸长率由39.7%(x=0.5)降低至6.8%(x=0.7)。经1100 ℃高温热处理,FCC枝晶相脱溶析出大量棒状B2相,可以提升合金强度,而BCC/B2调幅组织转变为FCC和B2双相组织(FCC相含量增加),可以提升合金塑性。因此,以FCC枝晶组织为主的Al_(0.5)CoCrFeNi合金高温热处理后屈服强度和抗拉强度分别提升至370 MPa和866 MPa,伸长率降低至30.1%。相比而言,Al_(0.6)CoCrFeNi合金调幅组织体积分数有所增加,两种相变对合金组织和性能影响均较大,故而热处理态合金力学性能基本不变。Al_(0.7)CoCrFeNi和Al_(0.8)CoCrFeNi合金调幅组织体积分数更高,热处理态合金均表现为FCC和B2双相组织,合金塑性提升,强度降低。其中热处理态Al_(0.7)CoCrFeNi合金伸长率提升至14.2%,屈服强度和抗拉强度分别降低至586 MPa和1092 MPa。 |
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其他语种文摘
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Al_xCoCrFeNi (0.5≤x≤0.8) high-entropy alloys were prepared by arc-melting method and the effect of 1100 ℃ heat treatment on the microstructure and mechanical properties of the alloys was investigated. The results show that the as-cast Al_xCoCrFeNi (0.5≤x≤0.8) high-entropy alloys present FCC dendrite (x=0.5 and 0.6), “eutectic-like” structure (x=0.7) and BCC/B2 dendrite (x=0.8) morphologies successively as Al content increases. Correspondingly, the yield strength and tensile strength of the alloys increase from 291 MPa and 733 MPa (x=0.5) to 1004 MPa and 1423 MPa (x=0.7), respectively, and the elongation decreases from 39.7% (x=0.5) to 6.8% (x=0.7). After heat treatment at 1100 ℃, a large number of rod-like B2 phases are precipitated from the FCC dendrite region, which can improve the strength of heat-treated alloys, while the BCC/B2 spinodal structure transforms into FCC and B2 dual-phase structure, which can enhance the plasticity of heat-treated alloys. Therefore, the yield strength and tensile strength of heat-treated Al_(0.5)CoCrFeNi alloy with FCC dendrite morphology increase to 370 MPa and 866 MPa, respectively, and the elongation decreases to 30.1%. However, both phase transition behaviors have great influence on the microstructure and property of Al_(0.6)CoCrFeNi alloy due to the increasing fraction of spinodal structure. Therefore, the mechanical properties of heat-treated Al_(0.6)CoCrFeNi alloy are basically unchanged in comparison to that of the as-cast alloy. The as-cast Al_(0.7)CoCrFeNi and Al_(0.8)CoCrFeNi alloys contain higher fractions of spinodal structure, while the heattreated alloys present typical FCC and B2 dual-phase structure, resulting in an increase of plasticity but a decrease of strength. Correspondingly, the elongation of heat-treated Al_(0.7)CoCrFeNi alloy increases to 14.2%, and the yield strength and tensile strength decrease to 586 MPa and 1092 MPa, respectively. |
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来源
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材料工程
,2024,52(1):249-258 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2023.000067
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关键词
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高熵合金
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热处理
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相变
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微观组织
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力学性能
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地址
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北方工业大学机械与材料工程学院, 北京, 100144
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金项目
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北京市教委科技一般项目
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北京市自然科学基金
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北方工业大学青年毓优人才支持计划
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文献收藏号
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CSCD:7652210
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参考文献 共
34
共2页
|
|
1.
Cantor B. Microstructural development in equiatomic multicomponent alloys.
Materials Science and Engineering:A,2004,375/377:213-218
|
CSCD被引
691
次
|
|
|
|
|
2.
Yeh J W. Nanostructured highentropy alloys with multiple principal elements: novel alloy design concepts and outcomes.
Advanced Engineering Materials,2004,6(5):299-303
|
CSCD被引
1343
次
|
|
|
|
|
3.
Otto F. Relative effects of enthalpy and entropy on the phase stability of equiatomic high-entropy alloys.
Acta Materialia,2013,61(7):2628-2638
|
CSCD被引
84
次
|
|
|
|
|
4.
Cao L. Microstructural evolution, phase formation and mechanical properties of multi-component Al-CoCrFeNix alloys.
Applied Physical A,2019,125:699
|
CSCD被引
4
次
|
|
|
|
|
5.
Feuerbacher M. Hexagonal high-entropy alloys.
Materials Research Letters,2015,3(1):1-6
|
CSCD被引
13
次
|
|
|
|
|
6.
Lu Y. A promising new class of hightemperature alloys: eutectic high-entropy alloys.
Scientific Reports,2014,4:6200
|
CSCD被引
181
次
|
|
|
|
|
7.
Tong C J. Mechanical performance of the AlxCoCrCuFeNi high entropy alloy system with multiprincipal elements.
Metallurgical and Materials Transaction A,2005,36(5):1263-1271
|
CSCD被引
95
次
|
|
|
|
|
8.
Poulia A. Microstructure and wear behavior of a refactory high entropy alloy.
International Journal of Refractory Metals & Hard Materials,2016,57:50-63
|
CSCD被引
21
次
|
|
|
|
|
9.
苗军伟. AlCr_(1.3)TiNi_2共晶高熵合金的高温摩擦学性能及磨损机理.
金属学报,2023,59(2):267-276
|
CSCD被引
3
次
|
|
|
|
|
10.
Miao J W. Tribological behavior of an AlCoCrFeNi_(2.1) eutectic high entropy alloy sliding against different counterfaces.
Tribology International,2021,153:106599
|
CSCD被引
17
次
|
|
|
|
|
11.
Lu Y. A promising new class of irradiation tolerant materials: Ti_2ZrHfV_(0.5)Mo_(0.2) high-entropy alloy.
Journal of Materials Science and Technology,2019,35(3):369-373
|
CSCD被引
70
次
|
|
|
|
|
12.
Wang W R. Phases, microstructure and mechanical properties of AlxCoCrFeNi high-entropy alloys at elevated temperatures.
Journal of Alloys and Compounds,2014,589(9):143-152
|
CSCD被引
59
次
|
|
|
|
|
13.
Lu Y. Directly cast bulk eutectic and near-eutectic high entropy alloys with balanced strength and ductility in a wide temperature range.
Acta Materialia,2017,124:143-150
|
CSCD被引
169
次
|
|
|
|
|
14.
武俊霞. 难熔高熵合金成分设计微观组织及性能研究进展.
航空材料学报,2022,42(6):33-47
|
CSCD被引
13
次
|
|
|
|
|
15.
Wang W R. Effects of Al addition on the microstructure and mechanical property of AlxCoCrFeNi high-entropy alloys.
Intermetallics,2012,26:44-51
|
CSCD被引
128
次
|
|
|
|
|
16.
Gludovatz B. A fracture-resistant high-entropy alloy for cryogenic applications.
Science,2014,345(6201):1153-1158
|
CSCD被引
515
次
|
|
|
|
|
17.
Schuh B. Mechanical properties, microstructure and thermal stability of a nanocrystalline CoCrFeMnNi high-entropy alloy after severe plastic deformation.
Acta Materialia,2015,96:258-268
|
CSCD被引
93
次
|
|
|
|
|
18.
He J Y. A precipitationhardened high-entropy alloy with outstanding tensile properties.
Acta Materialia,2016,102:187-196
|
CSCD被引
235
次
|
|
|
|
|
19.
Shi P. Hierarchical crack buffering triples ductility in eutectic herringbone high-entropy alloys.
Science,2021,373(6557):912-918
|
CSCD被引
55
次
|
|
|
|
|
20.
Miao J W. Enhanced surface properties of the Al_(0.65)CoCrFeNi high-entropy alloy via laser remelting.
Materials,2023,16:1085
|
CSCD被引
2
次
|
|
|
|
|
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