Dependence of mechanical properties on the microstructure characteristics of a near β titanium alloy Ti-7333
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第1期
论文作者：Ruifeng Dong Jinshan Li Hongchao Kou Jiangkun Fan Bin Tang
文章页码：48 - 54
摘 要：In this work, the microstructure and the corresponding tensile properties of the rolled Ti-7Mo-3Nb-3Cr-3Al（Ti-7333） alloy before and after the thermal treatments were investigated. The results show that a strong α-fiber texture is developed in the rolled Ti-7333 alloy. The deformed matrix and the texture significantly induce the variant selection of β phase. The high strength of the rolled Ti-7333 alloy is attributed to the <110> texture parallel to the tensile direction and the dispersed α phase within the matrix. After the solution treatment followed by the aging treatment, the texture decreases and the microstructure consists of the equiaxed β grains, the spheroidal αp phase and various needle-like α variants. Eventually, the alloy could achieve an optimal combination with the strength of about 1450 MPa,the ductility of about 10.5% and a considerable shear strength of about 775 MPa. This balance can be ascribed to the performance of the spheroidal αp phase and various needle-like αs variants. The results indicate that the Ti-7333 alloy could be a promising candidate material for the high-strength fastener.
Ruifeng Dong1，Jinshan Li1,2，Hongchao Kou1,2，Jiangkun Fan1，Bin Tang1
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University2. National & Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Matfigerials
摘 要：In this work, the microstructure and the corresponding tensile properties of the rolled Ti-7Mo-3Nb-3Cr-3Al（Ti-7333） alloy before and after the thermal treatments were investigated. The results show that a strong α-fiber texture is developed in the rolled Ti-7333 alloy. The deformed matrix and the texture significantly induce the variant selection of β phase. The high strength of the rolled Ti-7333 alloy is attributed to the <110> texture parallel to the tensile direction and the dispersed α phase within the matrix. After the solution treatment followed by the aging treatment, the texture decreases and the microstructure consists of the equiaxed β grains, the spheroidal αp phase and various needle-like α variants. Eventually, the alloy could achieve an optimal combination with the strength of about 1450 MPa,the ductility of about 10.5% and a considerable shear strength of about 775 MPa. This balance can be ascribed to the performance of the spheroidal αp phase and various needle-like αs variants. The results indicate that the Ti-7333 alloy could be a promising candidate material for the high-strength fastener.
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