冷卻速率對(duì)含銅鈦合金顯微組織和性能的影響冷卻速率對(duì)含銅鈦合金顯微組織和性能的影響EFFECT OF COOLING RATE ON MICROSTRUCTURE AND PROPERTIES OF A CU-CONTAINING TITANIUM ALLOY 含銅鈦合金具有優(yōu)異的抗菌功能和廣泛的臨床應(yīng)用前景，但銅元素的加入會(huì)影響合金的顯微組織及性能。本文研究了熱處理后的冷卻速度對(duì)Ti6Al4V-5Cu合金顯微組織、力學(xué)性能、耐蝕性能及抗菌性能的影響。將合金分別進(jìn)行不同冷卻方式的熱處理，即在740℃三相區(qū)分別進(jìn)行淬火、空冷和爐冷，在820℃兩相區(qū)和910℃單相區(qū)分別進(jìn)行淬火。研究結(jié)果表明，爐冷合金由于初生α相的尺寸和體積分?jǐn)?shù)最大，所以塑性最好；合金在740℃和820℃分別淬火后由于組織中存在斜方α"相，其硬度和屈服強(qiáng)度顯著降低；合金在910℃淬火后由于存在針狀的六方α′相，其硬度和抗拉強(qiáng)度最高，但塑性最差。隨著熱處理溫度的升高，合金中的元素分布逐漸均勻，其耐蝕性能隨之提高。改變冷卻速率并不明顯影響合金的抗菌性能，不同冷卻速率下的合金都具有優(yōu)異的抗菌性能。 The Cu-containing titanium alloy has been proved to possess excellent antibacterial performance, which has great potential for clinical application. In this study, the effect of cooling rate on the microstructure, mechanical properties, corrosion resistance and antibacterial property of a Ti6Al4V-5Cu alloy was investigated. Results showed that the furnace-cooled alloy exhibited the best ductility because of the maximum size and volume fraction of the primary α phase in microstructure. The alloy samples quenched from 740 ℃ and 820 ℃ respectively demonstrated low hardness and yield strength due to the existence of orthorhombic α" phase in microstructure. The 910 ℃quenched alloy sample showed the highest hardness and tensile strength, but the lowest plasticity because of the presence of acicular hcp α′ phase. With increase of the heating temperature, the elemental distribution in the alloy became more uniform, and therefore the corrosion resistance increased gradually. However, the cooling rate did not obviously change the antibacterial property of the alloy. The Ti6Al4V-5Cu alloy showed excellent antibacterial property under different cooling rate. 全文下載：http://pan.baidu.com/s/1bpkzvgr
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