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Ca含量对Mg-Zn合金组织及性能的影响

发表时间:2014-05-15  浏览量:1707  下载量:798
全部作者: 李春南,秦渊,杨森
作者单位: 南京理工大学材料科学与工程学院
摘 要: 采用熔剂保护法制备了3种不同组份的Mg-5.0Zn-xCa(x=0.5,1.0,2.0)合金,并对3种合金的组织演化规律及其性能进行了研究。结果表明:铸态Mg-Zn-Ca合金主要由α-Mg基体相和第二相Ca2Mg6Zn3相组成,第二相呈球状和条状,分别分布于晶内和晶界处,随Ca含量增加而增多,沿晶界形成连续和半连续的网状结构。Ca含量的增加可细化铸态Mg-Zn-Ca合金的晶粒尺寸,提高其屈服强度,但形成的粗大Mg2Ca脆性相使铸态合金的抗拉强度和延伸率变差,耐腐蚀性能也降低。Mg-5.0Zn-0.5Ca合金具有更好的生物活性,有利于羟基钙镁磷灰石的沉积,沉积物多,不容易脱落,表面较完整。
关 键 词: 金属材料;生物活性;合金化;Mg-Zn-Ca合金
Title: Effect of Ca content on microstructure and properties of Mg-Zn alloy
Author: LI Chunnan, QIN Yuan, YANG Sen
Organization: School of Materials Science and Engineering, Nanjing University of Science and Technology
Abstract: In this paper, three kinds of different components of Mg-5.0Zn-xCa (x=0.5, 1.0, 2.0) were fabricated by flux protection method, and microstructure evolution and properties of these alloys were studied. The results show that the as cast Mg-Zn-Ca alloy is mainly composed of α-Mg matrix phase and the second phase Ca2Mg6Zn3 with spherical like or strip like distributed within grains or at grain boundaries. With the increase of Ca content, the amount of secondary phases increases, forming a network structure of continuity and semi continuity along the grain boundaries. The grain is refined with increase of the Ca content, which results in a minor increase of the yield strength of the alloys, however the tensile strength and elongation of the as cast alloy reduces due to the formation of coarse Mg2Ca brittle phase, and corrosion resistance becomes worse as well. Mg-5.0Zn-0.5Ca alloy has better bioactivity than the others, is conducive to calcium and magnesium hydroxy apatite (Ca0.84Mg0.14)10(PO4)6(OH)2 deposition, and the deposition is not easy to fall off, sample surface is integrated.
Key words: metallic material; bioactivity; alloying; Mg-Zn-Ca alloy
发表期数: 2014年5月第9期
引用格式: 李春南,秦渊,杨森. Ca含量对Mg-Zn合金组织及性能的影响[J]. 中国科技论文在线精品论文,2014,7(9):859-865.
 
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