Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第11期    总第224期    2017年11月

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文章编号:1004-0609(2017)-11-2299-08
热处理温度对Zr44Co56合金显微组织和力学性能影响
李培友,王永善

(陕西理工大学 材料科学与工程学院,汉中 723000)

摘 要: 利用X射线衍射仪(XRD)、金相显微镜、万能试验机和扫描电镜(SEM)等仪器研究在不同热处理温度下Zr44Co56合金显微组织和力学性能。结果表明:在不同热处理温度下,试样显微组织由基体B2相和第二相B33相所组成;在热处理温度723、773和823 K下,B33相相对含量相对于铸态合金呈增加趋势;当热处理温度达到873 K时,少量的B33相在晶界处析出;随热处理温度增高,颗粒形状由铸态的小块状变为粗线条状,再到细条状。试样在723 K下热处理后,其屈服强度和线弹性极限值均大于铸态合金的相应值,而试样在773、823和873 K下热处理后,其屈服强度和线弹性极限值均小于铸态合金的相应值。试样在873 K下热处理后,当压缩应变达到18%时,其外表面无任何宏观裂缝,材料呈现加工硬化现象;而在其余温度下热处理后,材料断裂机制为延性断裂与解理断裂相混合的断裂机制。

 

关键字: Zr-Co合金;B33相;热处理温度;力学性能

Effect of heat treatment temperature on microstructure and mechanical properties of Zr44Co56 alloy
LI Pei-you, WANG Yong-shan

School of Materials and Engineering, Shaanxi University of Technology, Hanzhong 723000, China

Abstract:The microstructure and mechanical properties of Zr44Co56 alloy were studied by X-ray diffraction (XRD), metallographic microscopy, universal testing machine and scanning electron microscopy (SEM). The results show that the microstructures of the specimens at different heat-treatment temperatures are composed of B2 matrix phase and the second phase B33 phase. At heat-treatment temperatures of 723, 773 and 823 K, the relative content of the B33 phases exhibits an increasing trend comparing with the as-cast alloy. At 873 K, a small amount of the B33 phases precipitate at the grain boundaries; the particle shapes transform from the small bulk of as-casting state to thick line strip, and then to thin strips with increasing the heat-treatment temperature. The yield strength and elastic limit values of samples at the heat-treatment temperature of 723 K are greater than those of the as-cast alloy; however, the yield strength and elastic limit values of samples at heat-treatment temperatures of 773, 823 and 873 K are less than those of the as-cast alloy. When the compressive strain reaches 18%, the outer surface of the sample at the heat-treatment temperature of 873 K has no macroscopic cracks, and the material exhibits the work-hardening phenomenon; and the fracture mechanism of samples is the combining fracture mechanism of ductile fracture and cleavage fracture at other heat-treatment temperatures.

 

Key words: Zr-Co alloy; B33 phase; heat treatment temperature; mechanical property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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