本文關(guān)鍵詞： 鎂合金 顯微組織 力學(xué)性能 腐蝕性能 熱擠壓　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：鎂是人體必需的微量元素,而且具有良好的生物相容性,無(wú)毒無(wú)害并能在人體內(nèi)降解無(wú)需二次手術(shù)等諸多天然優(yōu)勢(shì),因此鎂合金具備成為生物植入材料的潛力。另外近年來(lái),由于新合金新工藝的引入,鎂合金的力學(xué)性能和耐腐蝕性能得到了進(jìn)一步提高,使鎂合金在生物植入材料方面的應(yīng)用成為可能。本文的研究目的是為開(kāi)發(fā)一種應(yīng)用于血管支架的生物鎂合金材料,這種血管支架材料具有良好的力學(xué)性能以及耐腐蝕性能。本文研究選取了具有良好生物相容性,能夠細(xì)化晶粒,并提高合金力學(xué)性能及耐腐蝕性能的Zn,Zr和Mn元素作為合金化元素,設(shè)計(jì)并制備了Mg-Zr-Zn-Mn系生物鎂合金。分別研究Mn,Zn元素含量對(duì)Mg-Zr-Zn-Mn系合金的顯微組織、力學(xué)性能和耐腐蝕性能的影響,從而找出最優(yōu)的Mn和Zn元素含量,使其具有優(yōu)良的綜合性能。最后對(duì)綜合性能最好的合金在不同擠壓溫度下進(jìn)行熱擠壓加工,研究分析熱擠壓處理對(duì)合金的組織和性能的影響,并確定最佳的擠壓溫度。研究結(jié)果如下:通過(guò)分別加入Mn,Zn元素以及進(jìn)行熱擠壓加工處理,鎂合金的顯微組織、力學(xué)性能和耐腐蝕性能均得到了顯著改善。(1)Mn元素對(duì)鑄態(tài)合金的顯微組織和力學(xué)性能的影響:在mg-0.4zr-4zn合金中添加mn元素后,可以細(xì)化鎂合金晶粒,有利于提高合金力學(xué)性能。由于mn元素在合金中不形成化合物,合金主要由鎂基體,mg0.97zn0.03相和mn顆粒相組成,隨著mn元素含量的增加,合金中一部分球狀mg0.97zn0.03相轉(zhuǎn)變?yōu)闂l狀第二相并沿晶界分布,而mn顆粒相則較均勻地分布于基體中。mn元素含量為1.5wt.%時(shí),合金的拉伸強(qiáng)度得到了顯著提高,屈服強(qiáng)度為122mpa,抗拉強(qiáng)度為240mpa,伸長(zhǎng)率為11.94%。(2)zn元素對(duì)鑄態(tài)合金的顯微組織和力學(xué)性能的影響:在mg-0.4zr-1.5mn合金中添加zn元素后,可以消除mn偏析并使mn顆粒相更加均勻分布,能夠顯著細(xì)化鎂合金晶粒,并且隨著zn元素含量的增加,合金的晶粒進(jìn)一步細(xì)化,另外合金中mg0.97zn0.03數(shù)量也逐漸增加,當(dāng)zn含量為2wt.%時(shí),合金的伸長(zhǎng)率達(dá)到最大,伸長(zhǎng)率為14.42%。隨著zn含量的進(jìn)一步增加,合金晶粒尺寸也隨之降低,基體中mg0.97zn0.03增多,從而有助于合金的屈服強(qiáng)度和抗拉強(qiáng)度提高,但伸長(zhǎng)率降低。當(dāng)合金中zn含量增加至5wt.%時(shí),合金中條狀mg0.97zn0.03則顯著增多,不利于合金力學(xué)性能的提高。當(dāng)zn含量為4wt.%時(shí),合金的屈服強(qiáng)度和抗拉強(qiáng)度達(dá)到最高值。(3)熱擠壓可以顯著細(xì)化mg-0.4zr-4zn-1.5mn合金的晶粒,大大提高了合金的力學(xué)性能。擠壓態(tài)合金的平均晶粒尺寸由鑄態(tài)合金的163.9μm下降到約7μm左右,并且合金中mg0.97zn0.03相更加細(xì)小并彌散分布,有利于擠壓態(tài)合金力學(xué)性能進(jìn)一步提高。另外擠壓溫度對(duì)合金的力學(xué)性能也有較大影響,當(dāng)擠壓溫度為300℃時(shí),合金的力學(xué)性能最高,屈服強(qiáng)度為220MPa,抗拉強(qiáng)度為300MPa,伸長(zhǎng)率為18.71%,隨著擠壓溫度的升高,合金的力學(xué)性能逐漸降低。擠壓前均勻化熱處理可以使粗大的樹(shù)枝晶和第二相溶于基體,可以提高合金的可擠性。(4)腐蝕實(shí)驗(yàn)結(jié)果表明:添加適量的Mn元素能提高鎂合金的耐腐蝕性能,但當(dāng)Mn元素含量超過(guò)1.5wt.%時(shí),合金的耐腐蝕性能降低。Zn元素可以顯著提高合金的耐腐蝕性能,當(dāng)Zn含量為2wt.%時(shí),合金擁有最好的耐腐蝕性能,然而隨著Zn含量的增加,合金中Mg0.97Zn0.03增多,導(dǎo)致合金的耐腐蝕性能降低。熱擠壓能夠顯著提高M(jìn)g-0.4Zr-4Zn-1.5Mn合金的耐腐蝕性能,并且擠壓溫度為300℃時(shí)合金的耐腐蝕性能比擠壓溫度為330℃和350℃時(shí)合金的耐腐蝕性能強(qiáng)。
[Abstract]:Magnesium is an essential trace element, but also has good biocompatibility, non-toxic and degradation in the human body without surgery two times and many other natural advantages, so magnesium alloy has become the biomaterials potential. In recent years, due to the introduction of new technology and new alloy, the mechanical properties of magnesium alloy and resistance the corrosion performance has been further improved, the magnesium alloy can be used in biological implant materials. The purpose of this study is to develop a biological magnesium alloy material applied to the stent, the stent material has good mechanical properties and corrosion resistance. This study has good biocompatibility, can refine grain, and improve the mechanical properties and corrosion resistance of Zn, Zr and Mn elements as alloying elements, design and Mg-Zr-Zn-Mn bio magnesium alloy was prepared respectively research. The Mn and Zn content on Microstructure of Mg-Zr-Zn-Mn alloy, mechanical properties and corrosion resistance, so as to find out the Mn and Zn elements were optimal, which has excellent comprehensive performance. Finally, the comprehensive performance of the best alloy at different extrusion temperature of hot extrusion processing, analysis on the effect of hot extrusion microstructure and properties of the alloy, and to determine the best extrusion temperature. The results are as follows: by joining Mn, Zn elements and process of hot extrusion of magnesium alloy, microstructure, mechanical properties and corrosion resistance were significantly improved. (1) effects on Microstructure and mechanical cast alloy the performance of the Mn elements: the addition of Mn element in mg-0.4zr-4zn alloy, magnesium alloy can refine grain, improve the mechanical properties of the alloy. Because Mn elements do not form compounds in the alloy, alloy is mainly composed of magnesium base Body, mg0.97zn0.03 phase and Mn particle phase, with the increase of Mn content in the alloy part of spherical mg0.97zn0.03 phase into strips and the second phase along the grain boundary, while the Mn particles are uniformly distributed in the matrix of.Mn element content is 1.5wt.%, the tensile strength of the alloy has been significantly improved, 122mpa yield strength, tensile strength 240mpa, elongation of 11.94%. (2) influence on Microstructure and mechanical properties of Zn cast alloy elements: the addition of Zn element in mg-0.4zr-1.5mn alloy, can eliminate the segregation of Mn and Mn particles are more uniform distribution, can refine grains of magnesium alloy, and with increase of Zn content the alloy grains are further refined, the number of mg0.97zn0.03 in the alloy will increase gradually, when the Zn content is 2wt.%, the elongation of the alloy reaches the maximum elongation of 14.42%. with the content of Zn further Increase the grain size of the alloy decreases, mg0.97zn0.03 in the matrix increased, thereby improving the yield strength and tensile strength in alloys, but the elongation decreased. When the Zn content in the alloy increases to 5wt.%, the alloy strip mg0.97zn0.03 is significantly increased, is not conducive to improve the mechanical properties of the alloy. When the Zn content is 4wt.%. The yield strength of the alloy and the tensile strength reaches the maximum value. (3) the hot extrusion grain can greatly refine mg-0.4zr-4zn-1.5mn alloy, greatly improve the mechanical properties of the alloy. The average grain size of the extruded alloy made of cast alloy 163.9 m down to about 7 m, and mg0.97zn0.03 in the alloy phase is more fine and diffuse distribution, is conducive to further improve the mechanical properties of the extruded alloy extrusion temperature on the mechanical properties. The alloy was also affected, when the extrusion temperature is 300 degrees centigrade, the mechanical properties of the alloy High yield strength 220MPa, tensile strength 300MPa, elongation is 18.71%, with the increase of the extrusion temperature, the mechanical properties of the alloy decreases gradually. Homogenization heat treatment before extrusion can make coarse dendrite and the second phase dissolved in the matrix, can improve the alloy can be squeezed. (4) the experimental results show that the corrosion adding an appropriate amount of Mn element can improve the corrosion resistance of magnesium alloy, but when the Mn content exceeds 1.5wt.%, the corrosion resistance of alloy decreased.Zn element can significantly improve the corrosion resistance of the alloys, when the Zn content is 2wt.%, the alloy has good corrosion resistance, however, with the increase of Zn content, alloy Mg0.97Zn0.03 leads to increased, the corrosion resistance of alloy decreased. Hot extrusion can improve the corrosion resistance of Mg-0.4Zr-4Zn-1.5Mn alloy, and the extrusion temperature is 300 DEG C when the alloy corrosion resistance than the extrusion temperature is 330 DEG C The corrosion resistance of the alloy is strong at 350 C.

【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG146.22;R318.08

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