(1. 昆明理工大學 材料科學與工程學院，昆明 650093；
2. 云南省鈦材應用產(chǎn)品工程技術研究中心，昆明 650093)
摘 要: 利用放電等離子燒結技術(SPS)制備Ti-3Zr-2Sn-3Mo-15Nb合金，研究燒結溫度對合金致密度、微觀組織與力學性能的影響。結果表明：在1 000~1 150 ℃燒結溫度范圍內(nèi)，合金具有較高致密度和抗壓強度，合金主要由β-Ti相與Ti-Nb-Zr-Mo固溶體形成的混合基體組織及少量α-Ti相和未熔化的Nb金屬顆粒組成；隨著燒結溫度的升高，合金的致密度和抗壓強度呈增大趨勢，合金中Ti-Nb-Zr-Mo固溶體含量越來越低，其尺寸越來越小，殘留的α-Ti相出現(xiàn)了向β-Ti相的轉變；合金的壓縮彈性模量值在45~54 GPa之間，顯示出良好的力學相容性，而燒結溫度的升高使得壓縮彈性模量值出現(xiàn)緩慢增大現(xiàn)象。
關鍵字: Ti-Zr-Sn-Mo-Nb合金；放電等離子燒結；燒結溫度；微觀組織；力學性能
（1. School of Materials Science and Engineering, Kunming University of Science and Technology,
Kunming 650093, China;
2. Engineering Technology Research Center of Titanium Products and Application of Yunnan Province,
Kunming 650093, China）
Abstract:Ti-3Zr-2Sn-3Mo-15Nb alloys were prepared by spark plasma sintering (SPS) technology. The effects of the different sintering temperatures on the relative density, microstructure and mechanical properties of the alloys were investigated. The results show that, in the sintering temperature range from 1 000 to 1 150 ℃, the alloys present high densification and compressive strength. The alloys mainly contain the mixed matrix consisting β-Ti phase and the Ti-Nb-Zr-Mo solid solution and some α-Ti phase and unmelted Nb metal particles. With the increase of the sintering temperature, the relative density and the compressive strength of the alloys increase. The size and the amount of the Ti-Nb-Zr-Mo solid solution decrease, and the alloys appear in the transformation process from α-Ti to β-Ti phase. The alloys exhibit low compressive elastic modulus in 45-54 GPa, which reveals the better mechanical compatibility. With the increase of the sintering temperature, the compressive elastic modulus of the alloys increases slowly.
Key words: Ti-Zr-Sn-Mo-Nb alloy; spark plasma sintering; sintering temperature; microstructure; mechanical property
