(Mo,Zr,Ti)_xO_y粒子对旋锻Mo-Ti-Zr合金性能和组织的影响  

Influence of (Mo, Zr, Ti)_xO_y particles on mechanical properties and microstructure of rotary forging Mo-Ti-Zr alloy

作　　者：罗明[1] 范景莲[1] 成会朝[1] 田家敏[1] 卢明园[1] 

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》2008年第6期335-339,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金委员会创新研究群体科学基金项目(50721003)

摘　　要：以Mo粉、Ti粉、Zr粉为原料,采用冷等静压和1920℃高温烧结工艺制备直径28mm的Mo-0.55%Ti-0.1%Zr(数据为质量分数)合金棒,将合金棒进行旋锻形变强化处理后,再用LJ-3000A型拉伸试验机及JSM-5600LV型扫描电镜等研究第二相氧化物颗粒(Mo,Zr,Ti)xOy对旋锻合金棒抗拉强度和显微组织的影响.研究结果表明:对烧结态钼合金进行旋锻处理可提高钼合金抗拉强度,在1250℃旋锻断面收缩率达到33%时,钼合金棒外围比心部密度高而拉伸强度低。(Mo,Zr,Ti)xOy粒子对Mo-Ti-Zr合金具有强化作用,但易于弱化钼晶粒界面而产生断裂并促进再结晶,使钼晶粒发生长大。Mo-0.55Ti-0.1Zr rod （d 28 mm） was prepared by mixing of the elemental powders according to their mass fraction of Mo：Ti：Zr=99.35：0.55：0.1, and via cold isostatic pressing and high temperature sintering at 1 920℃, the alloy rod was then processed through rotary forging. The influences of （Mo, Zr, Ti）xOy particles on tensile strength and microstructure of the rotary forging alloy were also investigated by using LJ-3000A tensile test machine, JSM-5600LV scanning electron microscope, and so on. The results show that the tensile strength of the molybdenum alloy increases through the rotary forging. When the reduction of cross section of the rotary forging alloy rods reaches 33% at 1 250℃, the outside part density of molybdenum alloy rod is higher than its inside part but the tensile strength is opposite. Though strengthening Mo-Ti-Zr alloy, （Mo, Zr, Ti）/Oy particles are easy to weaken the interface between molybdenum grains and result in fracture and recrystallization of molybdenum grains, then the molybdenum grains grow up.

关 键 词：Mo—Ti—Zr合金 (Mo Zr Ti)xOy粒子 旋锻 断口形貌 

分 类 号：TB125.2[理学—工程力学]