通过失重法和电化学测试研究了稀土元素Gd对Mg-6Zn-Zr合金耐腐蚀性能的影响,并通过光学显微镜、扫描电镜和能谱仪观察了合金的显微组织和腐蚀形貌特征。结果表明：稀土Gd的添加有效细化了合金的晶粒,同时形成了Mg2Gd相和Mg-Zn-Gd相。随...通过失重法和电化学测试研究了稀土元素Gd对Mg-6Zn-Zr合金耐腐蚀性能的影响,并通过光学显微镜、扫描电镜和能谱仪观察了合金的显微组织和腐蚀形貌特征。结果表明：稀土Gd的添加有效细化了合金的晶粒,同时形成了Mg2Gd相和Mg-Zn-Gd相。随稀土元素Gd的添加,合金的腐蚀速率先增后减。当稀土Gd含量达到1.5wt%时,较基体合金自腐蚀电位提升36 m V,腐蚀速率下降40%,即Mg-Zn-Zr-1.5Gd合金的耐腐蚀性较好。展开更多
The heat treatment microstructures and XRD patterns of the Mg-8Gd-5Y-2Zn-0.5Zr(wt.%) alloy in the absence and presence of a 10T high magnetic field have been investigated.The investigations show that the grains of α-...The heat treatment microstructures and XRD patterns of the Mg-8Gd-5Y-2Zn-0.5Zr(wt.%) alloy in the absence and presence of a 10T high magnetic field have been investigated.The investigations show that the grains of α-Mg demonstrate a preferred orientation due to the magnetic driving force.In addition,high magnetic fields can promote the growth of the long period ordered structure(LPS) phase to the grain interior.And the corresponding mechanisms are also discussed in this article.展开更多
In the as-cast Mg-Zn-Zr-Y alloys, the quasicrystal phases show massive and eutectoid plate morphologies. The selected area dijfraction(SAD) revealed that a large pan of the quasicrystals are face-centered icosahedral ...In the as-cast Mg-Zn-Zr-Y alloys, the quasicrystal phases show massive and eutectoid plate morphologies. The selected area dijfraction(SAD) revealed that a large pan of the quasicrystals are face-centered icosahedral (FCI), while a small amout of the quasicrystals belong to the simple icosahedral (SI) phase. It was found that in homogenized alloys, a part of the grain boundry phases was dissolved,and small massive W-phase and lath-shape MgZn_(2) phase dispersedly precipitate in the grains. The transformation of the quasicrystals relates to the temperature. After homogenizing at 360 ℃ , the quasicrystals still present, while after homogenizing at 400 ℃ , the quasicrystals transformed into a new C-type orthorhombic phase witha = 0.975 nm, b = 1.137nm and=0.935 nm.展开更多
文摘通过失重法和电化学测试研究了稀土元素Gd对Mg-6Zn-Zr合金耐腐蚀性能的影响,并通过光学显微镜、扫描电镜和能谱仪观察了合金的显微组织和腐蚀形貌特征。结果表明：稀土Gd的添加有效细化了合金的晶粒,同时形成了Mg2Gd相和Mg-Zn-Gd相。随稀土元素Gd的添加,合金的腐蚀速率先增后减。当稀土Gd含量达到1.5wt%时,较基体合金自腐蚀电位提升36 m V,腐蚀速率下降40%,即Mg-Zn-Zr-1.5Gd合金的耐腐蚀性较好。
基金National Natural Science Foundation of China(51371126)Science and Technology Supporting Program in Tianjin(14ZCZDGX00007)+1 种基金International Exchange-NSFC-RS(5131113013)Self-Create Program of Science and Technology Plan in Tianjin Binhai New Area(2012-BK120024)
基金Item Sponsored by the Fundamental Research Funds for the Central University[NO.DUT12JN02]
文摘The heat treatment microstructures and XRD patterns of the Mg-8Gd-5Y-2Zn-0.5Zr(wt.%) alloy in the absence and presence of a 10T high magnetic field have been investigated.The investigations show that the grains of α-Mg demonstrate a preferred orientation due to the magnetic driving force.In addition,high magnetic fields can promote the growth of the long period ordered structure(LPS) phase to the grain interior.And the corresponding mechanisms are also discussed in this article.
文摘In the as-cast Mg-Zn-Zr-Y alloys, the quasicrystal phases show massive and eutectoid plate morphologies. The selected area dijfraction(SAD) revealed that a large pan of the quasicrystals are face-centered icosahedral (FCI), while a small amout of the quasicrystals belong to the simple icosahedral (SI) phase. It was found that in homogenized alloys, a part of the grain boundry phases was dissolved,and small massive W-phase and lath-shape MgZn_(2) phase dispersedly precipitate in the grains. The transformation of the quasicrystals relates to the temperature. After homogenizing at 360 ℃ , the quasicrystals still present, while after homogenizing at 400 ℃ , the quasicrystals transformed into a new C-type orthorhombic phase witha = 0.975 nm, b = 1.137nm and=0.935 nm.
