时效处理对挤压态Mg-Y-Nd合金断裂行为的影响
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摘要
研究了不同温度时效对挤压态Mg-Y-Nd合金断裂行为的影响。结果表明,挤压态Mg-Y-Nd合金的断裂行为与时效工艺有密切的关系,这主要是不同温度时效导致了不同的析出相特征。挤压态Mg-Y-Nd合金主要由韧窝和撕裂棱组成,然而由于热挤压过程中少量粗β相的析出,部分区域也表现出解理断裂和晶间断裂。随着时效温度从150℃增加到280℃,析出序列从共格的β'相转变为半共格的β'相,最后转变为粗大稳定的β相。而断裂机制也从晶内断裂逐渐转变为晶间断裂。
Effects of aging at different temperature on the fracture behavior of extruded Mg-Y-Nd alloy were studied. The results show that there is a close relationship between the fracture behavior and aging process of extruded Mg-Y-Nd alloy, and this is mainly that aging at different temperatures leads to the characteristics of different precipitated phases. The extruded Mg-Y-Nd alloy mainly consists of dimples and tear edges. However, owing to the precipitation of a small amount of coarse βphase in the hot extrusion process, some regions also exhibit cleavage fracture and intergranular fracture. With aging temperatures increasing from 150℃ to 280℃, the precipitation sequence changes from coherent β' phase to semi-coherent β'phase, and finally to the coarse stable β phase. The fracture mechanism also changes from intragranular fracture to intergranular fracture.
Effects of aging at different temperature on the fracture behavior of extruded Mg-Y-Nd alloy were studied. The results show that there is a close relationship between the fracture behavior and aging process of extruded Mg-Y-Nd alloy, and this is mainly that aging at different temperatures leads to the characteristics of different precipitated phases. The extruded Mg-Y-Nd alloy mainly consists of dimples and tear edges. However, owing to the precipitation of a small amount of coarse βphase in the hot extrusion process, some regions also exhibit cleavage fracture and intergranular fracture. With aging temperatures increasing from 150℃ to 280℃, the precipitation sequence changes from coherent β' phase to semi-coherent β'phase, and finally to the coarse stable β phase. The fracture mechanism also changes from intragranular fracture to intergranular fracture.
引文
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[3]Anyi L,Huo L.Effect of substitution of minor Nd for Y on mechanical and damping properties of heat-treated Mg-Zn-Y-Zr alloy[J].Materials Science&Engineering A,2016,651:646-656.
[4]张利,荆洪英.不同变形工艺对Mg-5Zn-1Y合金组织及性能的影响[J].热加工工艺,2016,45(21):43-46.
[5]Liu X,Zhang Z,Qi C,et al.Effects of Nd Gd value on the microstructures and mechanical properties of Mg-Gd-Y-Nd-Zr alloys[J].Journal of Magnesium and Alloys,2016(4):214-219.
[6]Kondori A,Benzerga A.Modeling damage accumulation to fracture in a magnesium-rare earth alloy[J].Acta Materialia,2017,124:225-236.
[7]郭皓,韩振华,纪晓昀,等.时效处理对挤压态Mg-Zn-Ca-Nd合金力学及腐蚀性能的影响[J].热加工工艺,2017,46(4):241-248.
[8]Zheng K Y,Dong J,Zeng X Q,et al.Effect of precipitation aging on the fracture behavior of Mg-11Gd-2Nd-0.4Zr cast alloy[J].Materials Characterization,2008,59:857-862.
[9]Xin RL,Song B,Zeng K,et al.Effect of aging precipitation on mechanical anisotropy of an extruded Mg-Y-Nd alloy[J].Materials and Design,2012,34:384-388.
[10]Xin R L,Li L,Zeng K,et al.Structural examination of aging precipitation in a Mg-Y-Nd alloy at different temperatures[J].Materials Characterization,2011,62:535-539.
[11]Nie J F,Muddle B C.Characterization of strengthening precipitate phases in a Mg-Y-Nd alloy[J].Acta Materialia2000,48:1691-1703.
[12]Ardell J A.Precipitation hardening[J].Metallurgical and Materials Transactions:A-Physical Metallurgy and Materials Science,1985,16:2131-2165.
[13]Mott N F.Dislocations,plastic flow and creep[J].Proceedings of the Royal Society of London A,1953,220:1-14.
[14]Fu P H,Peng L M,Jiang H Y,et al.Fracture behavior and mechanical properties of Mg-4Y-2Nd-1Gd-0.4Zr(wt%)alloy at room temperature[J].Materials Science and Engineering A,2008,486:572-579.