Effects of sintering temperature and holding time on microstructure and mechanical properties of Ti-1Al-8V-5Fe prepared by spark plasma sintering

烧结温度和保温时间对放电等离子烧结制备Ti-1Al-8V-5Fe合金微观组织和力学性能的影响

Ti185 alloy is widely used in key industrial fields such as aerospace due to its excellent mechanical properties.The traditional method of preparing Ti185 alloy will inevitably appear“βfleck”,resulting in the decrease of mechanical properties,and the high price of V element limits the wide application of Ti185.In this paper,a low-cost master alloy V-Fe powder is used,a dense block is prepared by spark plasma sintering(SPS)technology,and a high-performance Ti185 alloy is prepared by controlling the sintering parameters.XRD and SEM were used to investigate the phase and microstructure of the samples prepared under different parameters.The compressive strength and friction properties of the directly prepared samples were studied.The samples with a sintering temperature of 1350 ℃ and a holding time of 30 min exhibited the most excellent comprehensive performance,with the highest compressive strength and lowest friction coefficient of 1931.59 MPa and 0.47,respectively.

Ti185合金具有出色的力学性能,被广泛应用于航空航天等领域。传统方法制备的Ti185合金不可避免地出现“β斑”,导致其力学性能下降,并且V的价格高昂限制了Ti185合金的广泛应用。本文使用低成本的中间合金V-Fe粉末,通过放电等离子烧结(SPS)技术制备致密块体,并通过控制烧结参数制备高性能Ti185合金。用XRD和SEM研究了在不同参数下制备样品的相和微观组织,研究了直接制备样品的抗压强度和摩擦性能。烧结温度为1350℃,保温时间为30 min的样品表现出最优异的综合性能,最高抗压强度和最低摩擦系数分别为1931.59 MPa和0.47。