Structure, castability and mechanical properties of commercially pure and alloyed titanium cast in graphite mould
Structure, castability and mechanical properties of commercially pure and alloyed titanium cast in graphite mould
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DOI：
10.1111/j.1365-2842.2003.01151.x
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发表时间：
2007-07-01
影响因子：
2.9
通讯作者：
Lin, J. H. Chern
中科院分区：
文献类型：
--
作者：
Cheng, W. W.;Ju, C. P.;Lin, J. H. Chern
研究了钛合金中Ta、Mo、Nb、Hf、Zr、Sn、Bi、Ag等合金元素的含量（质量分数）为5%时，钛合金的组织、铸造性能、力学性能和腐蚀性能。结果表明，当合金元素的添加量为1%时，Bi和Mo对提高纯钛的铸造性能最为有效。随着合金元素含量的增加，大多数合金的铸造性能都有不同程度的下降。除Ti-Mo系外，所有具有细针状形貌的钛合金都具有与具有典型板条状形貌的c. p. Ti相同的晶体结构（hcp）。当添加3wt%或更多的Mo时，形成更细的正交α“相。钛合金的显微硬度和抗弯强度均高于纯钛。在所有合金中，Ti-Mo系合金的硬度和强度最高。对于某种合金，抗弯强度并不一定随合金含量的增加而增加。除Ti-5 Zr和Ti-Mo合金外，其余合金的弯曲模量与纯钛相差不大。所有合金在37 ℃的Hanks溶液中显示出优异的耐腐蚀性。
This report is a study of structure, castability, mechanical properties as well as corrosion behaviour of titanium doped with up to 5 weight percentage (wt%) of a series of alloy elements, including Ta, Mo, Nb, Hf, Zr, Sn, Bi and Ag. The results indicate that, with addition of 1 wt% alloy element, Bi and Mo were most effective in enhancing the castability of titanium. With more alloy elements added, the castability values of most alloys more or less decreased. Except Ti-Mo system, all Ti alloys with a fine acicular morphology had the same crystal structure (hcp) as that of c.p. Ti with a typical lath type morphology. When 3 wt% or more Mo was added, a finer orthorhombic alpha'' phase was formed. The microhardness and bending strength values of Ti alloys were all higher than those of c.p. Ti. Among all alloys, Ti-Mo system exhibited the highest hardness and strength level. For a certain alloy, the bending strength did not necessarily increase with its alloy content. Except Ti-5Zr and Ti-Mo alloys, the bending moduli of most alloy systems were not much different from that of c.p. Ti. All alloys showed an excellent resistance to corrosion in Hanks' solution at 37 degrees C.