论文部分内容阅读
研究了热处理对高强Zr_(47)Ti_(45)Al_5V_3(质量分数,%)合金微观组织和力学性能的影响.结果表明,该合金初始加工态由α(hcp)和β(bcc)2相组成,板条状的α相均匀分布在β相基体上.合金虽然具有很高的强度,但塑性很小,其抗拉强度为1648MPa,而其延伸率只有0.8%.DSC结果表明,合金在560~750℃之间有α→β的相转变.对热处理后样品的力学性能检测结果表明,合金中β相含量的增多,使其塑性提高,但强度有所降低;通过在α→β相变点上不同温度的退火处理,调控α与β相的相对含量可以获得强度和塑性的良好配合.当合金中β相的体积分数为60%左右时,合金具有较佳综合力学性能,其抗拉强度为1398 MPa,延伸率达到3.1%.
The effects of heat treatment on microstructure and mechanical properties of high strength Zr 47 Ti 45 Al 5 V 3 (mass fraction,%) alloy were investigated. The results show that the initial state of the alloy consists of α (hcp) and β (bcc) 2 phases , The strip-like α phase is evenly distributed on the β-phase matrix.Although the alloy has a high strength, but the plasticity is small, the tensile strength of 1648MPa, and its elongation is only 0.8% .DSC results show that the alloy in 560 ~ 750 ℃, the phase transformation of α → β.The mechanical properties of the samples after heat treatment showed that the increase of β phase content in the alloy increased the plasticity but decreased the strength of the alloy. Point annealed at different temperatures to control the relative content of α and β phase can get a good combination of strength and plasticity.When the volume fraction of β phase is about 60%, the alloy has better mechanical properties, the tensile The strength is 1398 MPa and the elongation is 3.1%.