(1. 南京工程學(xué)院材料工程學(xué)院，南京 211167；
2. 江蘇省先進(jìn)結(jié)構(gòu)材料與應(yīng)用技術(shù)重點(diǎn)實(shí)驗(yàn)室，南京 211167；
3. 江蘇康尚醫(yī)療器械有限公司，丹陽 212300)
摘 要: 為提高生物鎂合金的力學(xué)和腐蝕性能，對(duì)擠壓態(tài)Mg-3Gd-1Nd-0.3Sr-0.2Zn-0.4Zr鎂合金進(jìn)行不同溫度的時(shí)效處理，研究時(shí)效溫度對(duì)合金顯微組織、室溫力學(xué)性能和在模擬體液中腐蝕性能的影響。結(jié)果表明：合金的析出相呈針狀且富含Zr元素。時(shí)效處理后合金的顯微硬度和屈服強(qiáng)度均比擠壓態(tài)的高，且隨時(shí)效溫度的升高先升高后降低，當(dāng)時(shí)效溫度為185 ℃時(shí)，合金的顯微硬度和屈服強(qiáng)度最高。腐蝕速率隨著時(shí)效溫度的升高先降低后升高，時(shí)效溫度為230 ℃時(shí)，其質(zhì)量損失腐蝕速率為擠壓態(tài)的52%±7%。
關(guān)鍵字: 時(shí)效處理；生物鎂合金；力學(xué)性能；腐蝕性能
（1. School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China;
2. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, China;
3. Jiangsu Konsung Equipment Co., Ltd, Danyang 212300, China）
Abstract:In order to improve the mechanical and corrosion properties of biomagnesium alloy, the aging treatments at different temperatures were conducted on the as-extruded Mg-3Gd-1Nd-0.3Sr-0.2Zn-0.4Zr alloy. The effects of the aging temperature on microstructure, room-temperature mechanical properties and corrosion properties in simulated body fluid of the alloy were studied. The results show that the Zr-rich needle-like precipitate is observed. The microhardness and yield strength of the alloy after aging treatment are higher than those of the as-extruded alloy, and they first increase and then decline with increasing aging temperature. The highest microhardness and yield strength are obtained at the aging temperature of 185 ℃. The corrosion rate of the alloy first decreases and then increases with increasing aging temperature, and the lowest corrosion rate of the alloy is acquired aged at 230 ℃, which is only 52%±7% compared to that of the as-extruded alloy obtained by mass loss test.
Key words: aging treatment; biomagnesium alloy; mechanical property; corrosion property
