首页|Mechanical Behavior and Failure Mechanism of an As-Extruded Mg-11 wt％Y Alloy at Elevated Temperature

Mechanical Behavior and Failure Mechanism of an As-Extruded Mg-11 wt％Y Alloy at Elevated Temperature

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Through carrying out the high-temperature tensile experiments on an as-extruded Mg-11wt％Y alloy at 350 ℃,400 ℃,450 ℃,500 ℃ and 550 ℃,the mechanical behavior and fracture mechanisms at elevated temperatures are investigated and compared.Tensile results show that with the increase of temperature,the yield strength and ultimate tensile strength of the alloy increase at first and then decrease,while that the elongation ratio decreases firstly and then increases.For the sample being tested at 350 ℃,the values of yield strength,ultimate tensile strength and the elongation ratio are 188 MPa,266 MPa and 11％,respectively.At 400 ℃,the yield strength and ultimate tensile strength reach the maximum values of,respectively,198 MPa and 277 MPa,but the elongation ratio is the lowest and its value is only 8％.When the applied tem-perature is increased to 550 ℃,the values of yield strength and ultimate tensile strength,respectively,decrease to 140 MPa and 192 MPa and the elongation ratio increases to 38％.Failure analysis demonstrates that the fracture surfaces of different samples are mainly composed of plastic dimples and exhibit the typical characteristic of ductile fracture.The observation to the fracture side surfaces indicates that at the temperatures of 350 ℃ and 400 ℃,microcracks mainly initiate in the interior of Mg24Y5 particles.When the temperatures are 450 ℃,500 ℃ and 550 ℃,the cracks preferentially initiate at the Mg24Y5/α-Mg interfaces.

Mg-Y alloyHigh-temperature tensile propertiesFracture mechanismFailure analysis

Lan Zhang、Dao-Kui Xu、Bao-Jie Wang、Cui-Lan Lu、Shuo Wang、Xiang-Bo Xu、Dong-Liang Wang、Xin Lv、En-Hou Han

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School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China

Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

School of Environmental and Chemical Engineering,Shenyang Ligong University,Shenyang 110159,China

Key Lab of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China

Institute of Corrosion Science and Technology,Guangdong 510070,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaLiaoning Province's project of"Revitalizing Liaoning Talents"Doctor Startup Fund of Natural Science Foundation Program of Liaoning ProvinceStrategic New Industry Development Special Foundation of ShenzhenInternational Joint Laboratory for Light Alloys,Liaoning BaiQianWan Talents ProgramDomain Foundation of Equipment Advance Research of 13th Fiveyear PlanNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaInnovation Fund of Institute of Metal Research(IMR)Chinese Academy of Sciences(CAS)National Basic Research Program of China(973 Program)Fundamental Research Fund for the Central UniversitiesBintech-IMR R&D Program

U21A204952071220518712115170112951971054XLYC19070622019-BS-200JCYJ20170306141749970614092201182017YFB07020012016YFB03011052013CB632205N2009006GYY-JSBU-2022-009

2024

10.1007/s40195-024-01700-5

金属学报(英文版)
中国金属学会

金属学报(英文版)

CSTPCD
影响因子：0.77
ISSN：1006-7191
年,卷(期)：2024.37(6)