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研究了两种铌基无磁定膨胀合金(Nb—30Zr和Nb—10Mo—10Ti—C—O_2合金)的组织结构及物理、机械性能。Nb—10 Mo—10 Ti一0.13 C—0.2 O_2合金成分均匀,除含有碳化物外,合金为单相固溶体。经高温处理,大块碳化物(ε相)固溶;并在冷却过程中,析出细小碳化物(Ti,Nb)(C、O_2,N),从而改善了合金的机加工性能,表面光洁度能达▽10。该合金的比重及膨胀系数的实测值与理论计算值基本相符。该合金的试验数据如下:ρ=7.95g/cm~3,α20—100℃=7.3×10~(-6)/℃,σ_b=101kgf/mm~2,δ=7％,R_c=34—35,磁化率为10~(-6)数量级,在≤200℃空气中不受氧化,且耐多种介质的腐蚀。用该合金做成陀螺马达转子外环,实用效果好。Nb—30Zr合金在1000—610℃,可从β固溶体分解出口β_2相。在610℃存在共析转变β_(Zr)→α_(Zr)β_(Nb)。α_(Zr)和β_(Nb)的膨胀系数相差较大。因此,Nb—30Zr合金的膨胀系数对组织结构的敏感性大。
The microstructures, physical properties and mechanical properties of two niobium-based magnetically-free expanding alloys (Nb-30Zr and Nb-10Mo-10Ti-C-O_2 alloys) The composition of Nb-10 Mo-10 Ti-0.13 C-0.2 O_2 alloy is uniform, except the carbide, the alloy is single-phase solid solution. After high temperature treatment, large carbides (ε phase) solid solution; and in the cooling process, precipitated small carbides (Ti, Nb) (C, O_2, N), thereby improving the machinability of the alloy surface finish Da ▽ 10. The measured value of the specific gravity and expansion coefficient of the alloy is basically in line with the theoretical calculation. The experimental data of the alloy are as follows: ρ = 7.95 g / cm 3, α 20-100 ° C = 7.3 × 10 -6 / ° C, σ_b = 101 kgf / mm 2, δ = 7%, R c 34-35 , The magnetic susceptibility is on the order of 10 ~ (-6), is free from oxidation in the air of ≤200 ℃, and is resistant to corrosion of many kinds of media. Made of the alloy rotor rotor outer ring, the practical effect is good. Nb-30Zr alloy at 1000-610 ℃, β solid solution can be decomposed exports β_2 phase. The eutectoid transformation β_ (Zr) → α_ (Zr) β_ (Nb) exists at 610 ℃. The coefficients of thermal expansion of α_ (Zr) and β_ (Nb) are quite different. Therefore, Nb-30Zr alloy expansion coefficient of the structure of the large sensitivity.