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題名 | Ti-Nb二元合金之成份/顯微組織與機械性質之間的關係=Composition/Phase Structure and Properties of Titanium-Niobium Alloys |
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作者姓名(中文) | 洪炎輝; 王建義; 鄭榮瑞; 葉建宏; 潘永寧; | 書刊名 | 鑄造工程學刊 |
卷期 | 30:4=123 2004.12[民93.12] |
頁次 | 頁33-40 |
分類號 | 454.9 |
關鍵詞 | 鈦鈮合金; 顯微組織; 楊氏係數; Titanium-niobium alloys; Microstructure; Elastic modulus; |
語文 | 中文(Chinese) |
中文摘要 | 本研究目的係開發一個人體骨骼楊氏係數相近之 Ti-Nb 合金。針對所探討 Nb 含量之範圍(14%-40wt%),實驗結果顯示,在 14wt% Nb 含量之鈦合金,呈現以 α 相為主之 α/β 雙相組織,而隨著 Nb 含量增加,α 相比例逐漸減少(β 相比例逐漸增加),當 Nb 含量達到34wt%以上,則呈現單一 β 相。其中 Nb 含量在30%-34wt%之間,經由 XRD 及 TEM 分析,有 ω 相析出。其次就楊氏係數變化而言,楊氏係數隨著 Nb 含量增加而逐漸降低,在26wt%達到最低值,然後再隨著 Nb 含量增加而逐漸增加,在 34wt%Nb 含量達到最高值,最後再隨著 Nb 含量增加而逐漸降低。由於楊氏係數與顯微組織(或 Nb 含量)有密切關係,因此 Nb 含量在30%-34%wt之間,楊氏係數的降低係由於 α 相比例減少( β 相比例增加)所致,而 Nb 含量在30%-34wt%之間,楊氏係數增加係由於 ω 相析出所致。在抗拉強度及降伏強度而言,強度隨著 Nb 含量增加而增加,在 34wt%Nb 含量達到最高值,然後再隨著 Nb 含量增加而大幅降低;在延伸率變化而言,其結果與強度剛好相反。對於生醫用植入材而言,若其楊氏係數過高,與自然骨之楊氏係數(10-30GPa)相差太大,會造成自然骨有骨質衰弱現象(stress shielding effect)。為減少骨質衰弱現象,高 Nb 含量(36wt%以上)之 Ti-Nb 合金為一具有潛力之生醫植入材。 |
英文摘要 | This study attempts to develop Ti-Nb alloys with elastic moduli that approach that of human bone. The experimental results reveal that the microstructure of a Ti-Nb alloy that contains 14 wt%Nb consists of α and β phases, with α phase being the dominant one. The proportion of the α phase decreases gradually as the Nb content increases, and the microstructure becomes completely the β phase when the Nb content exceeds 34 wt%. Moreover, the ω phase can be detected using XRD and TEM in alloys with a Nb content from 30 to 34 wt%. Over the Nb range studied (14 to 40 wt%), the elastic modulus decreases from 14 to 26 wt% Nb, and then increases to a maximum at 34 wt% Nb, before falling again as Nb content is increased further. The elastic modulus of the Ti-Nb alloys is closely related to the microstructure (or Nb content) of the alloys. The fall in the elastic modulus with the increasing Nb content from 14 to 26 wt% is associated with a gradual decrease in the proportion of the α phase in the microstructure, while the precipitation of the ω phase accounts for the increase in the elastic modulus over the intermediate range of Nb (30 to 34 wt%). The tensile strength of Ti-Nb alloys increases slightly from 14 wt% to 26 wt% Nb, and then increases markedly with a Nb content of up to 34 wt%, before falling drastically as Nb content is increased further. A similar pattern was obtained for 0.2% proof stress, while the elongation vs. %Nb curve was just the reverse of the T.S. vs. %Nb curve, as expected. A Ti-Nb alloy with a relatively high Nb content (above 36 wt%) is preferred to other compositions for use in medical implants with a reduced stress shielding effect.. |
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