Mn對生物醫(yī)用Ti-Mo合金組織與力學(xué)性能的影響

Mn對生物醫(yī)用Ti-Mo合金組織與力學(xué)性能的影響Effect of manganese addition on microstructure and mechanical properties of Ti-Mo Biomedical alloys

采用非自耗真空電弧爐制備Ti-8Mo-xMn系列合金，以考察Mn的添加對生物醫(yī)用Ti-Mo合金顯微組織與力學(xué)性能的影響。結(jié)果表明：兩元Ti-Mo合金主要由細(xì)小的針狀α″馬氏體相組成，加入1%Mn(質(zhì)量分?jǐn)?shù))后，等軸晶的β相大部被保留；當(dāng)Mn的加入量達(dá)到3%后，β相全部被保留到室溫。拉伸力學(xué)測試發(fā)現(xiàn)：β相不穩(wěn)定的Ti-8Mo-1Mn合金在拉伸過程中發(fā)生應(yīng)力誘導(dǎo)的從β相到α″相的馬氏體轉(zhuǎn)變，呈現(xiàn)出“雙屈服”現(xiàn)象。加入少量Mn(1%和3%)提高合金塑性，伸長率由35%最大提高到53%。Mn量增加到5%、7%后，合金強(qiáng)度得到大幅提高，抗拉強(qiáng)度最大由856 MPa提高到1201 MPa，同時(shí)伸長率為22%。所有含Mn合金的顯微硬度都較高，最高為386HV，是兩元Ti-Mo合金的(251HV)1.65倍。含ω相的Ti-8Mo-1Mn合金的彈性模量最高，達(dá)150 GPa。其它含Mn合金的彈性模量在76~87 GPa之間，與人骨骼的接近，有潛力成為生物醫(yī)用材料。

A series of Ti-8Mo-xMn alloys were fabricated by nonconsumable electrode vacuum arc furnace, the effect of Mn addition on the structure and mechanical properties of the alloy was investigated. The results indicate that α″ phase-dominated binary Ti-Mo alloy exhibits a fine, acicular martensitic structure. When 1% Mn (mass fraction) is added, most of equiaxed β phase structure is retained. With Mn content increasing to 3% (mass fraction), entire β phase is retained. Mn alloy with instability β phase exhibits the two-stage yielding from stress-strain curves due to the stress-induced martensite transformation from β to α″ during tensile deformation. Addition of a small amount of Mn (1% and 3 %) improves the plasticity of alloys, and the elongation increases from 35% to 53%. With Mn content increasing to 5% and 7% (mass fraction), the strength dramatically improves and tensile strength increases from 854 MPa to 1201 MPa, companied with 22% elongation. All the alloys with Mn exhibits the high microhardness, the highest is 386HV，which is 1.65 times than that of binary Ti-Mo alloy. The elastic modulus of Ti-8Mo-1Mn alloy with ω phase is the highest of all alloys 150 GPa. The elastic modulus of the other alloys with Mn are about 76~87 GPa, close to those of human skeletons. These alloys seem to have a great potential for use as an implant material.

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