退火温度对粉末冶金Ti-2Mn-2Sn-0.1B合金组织和力学性能的影响  

Effects of annealing temperature on microstructure and mechanical properties of Ti-2Mn-2Sn-0.1B alloy by powder metallurgy

作　　者：方浩煜 伍秋美[1] 袁铁锤[1] FANG Haoyu;WU Qiumei;YUAN Tiechui(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2024年第3期246-254,共9页Materials Science and Engineering of Powder Metallurgy

基　　金：江西省“双千计划”项目资助。

摘　　要：粉末冶金工艺在生产成本、成分设计自由度等方面具有显著优势,是制造低成本高性能钛合金的有效途径。本文采用粉末冶金技术制备Ti-2Mn-2Sn-0.1B合金,研究退火温度对合金组织和力学性能的影响。结果表明:Ti-2Mn-2Sn-0.1B合金均由α、β和TiB相组成,与未退火合金相比,750℃退火合金中β相含量增加,850℃退火合金中析出片状和针状α′相,950℃退火合金中α相和β相呈层状分布。合金均以韧性断裂为主,其中950℃退火合金力学性能较好,层状分布的α相与β相能够提供良好的强化和硬化效果,显微硬度(HV)、极限抗拉强度和伸长率分别为335±16、(803±4)MPa和(11.3±2.2)%。Powder metallurgy process has significant advantages in production cost,freedom of composition design and so on,and is an effective way to manufacture low-cost and high-performance titanium alloys.In this paper,Ti-2Mn-2Sn-0.1B alloys were prepared by powder metallurgy,and the effects of annealing temperature on microstructure and mechanical properties of the alloy were studied.The results show that all of the Ti-2Mn-2Sn-0.1B alloys are composed ofα,β,and TiB phases.Compared with the unannealed alloy,theβphase content in the alloy annealed at 750℃increases,the flake and needleα′phases are deposited in the alloy annealed at 850℃,and theαandβphases are distributed in layers in the alloy annealed at 950℃.All the alloys are mainly ductile fracture,and the alloy annealed at 950℃has better mechanical properties,the layeredαandβphase can provide good strengthening and hardening effects,and the microhardness(HV),ultimate tensile strength,and elongation are 335±16,(803±4)MPa,and(11.3±2.2)%,respectively.

关 键 词：粉末冶金 钛合金 显微组织 力学性能 热处理 

分 类 号：TG146.23[一般工业技术—材料科学与工程]