共查询到9条相似文献，搜索用时 78 毫秒
1.
2.
Ti－7．5Al－11Zr－1Nb－0．5Mo－0．1Si（BT18）合金是前苏联航空材料研究院（B11AM）于1963年研制成功的一种耐热铁合金,可用于制造500℃～600℃长时工作（6cob以下）的零件．T一65AI－2．SSn－4Zr－1Nb－O．7M0－0．15St田T18p合金是BT18的改型合金．与BT18合金相比,BT18Y的川、Zr含量降低,并以元素Sn进行补充合金化．BT18Y合金被推荐用于BT18铁合金相同的工作条件．由于BTISY合金通过用部分锡代替结并降低其铝错含量,虽然使其在工作温度下的瞬时强度有所降低,但有更好的热稳定性、抗闭变性能和冲击韧性等．BTIS… 相似文献
3.
Davis A. E. Caballero A. E. Biswal R. Williams S. Prangnell P. B. 《Metallurgical and Materials Transactions A》2022,53(11):3833-3852
Metallurgical and Materials Transactions A - The titanium alloy Ti–6Al–2Sn–4Zr–2Mo–0.1Si (Ti6242) has been deposited for the first time by a directed energy deposition... 相似文献
4.
为提高多孔医用钛合金的生物活性,以实现快速骨整合,首先利用微弧氧化法(MAO)在多孔Ti-3Zr-2Sn-3Mo-25Nb(TLM)合金表面制备出含Ca、P的次级微孔涂层,并在此涂层表面通过水热处理生成羟基磷灰石(HA),得到活性次级微孔涂层。采用X射线衍射、电子扫描显微镜和能谱仪分析了活性次级微孔涂层的相组成、微观形貌和元素特征,通过接触角测试实验对比研究了TLM钛合金表面改性前后的亲水性变化,并进一步通过动物实验研究了经表面活性次级微孔层改性后的多孔TLM钛合金的骨整合性能。结果表明,微弧氧化处理可在多孔TLM表面形成规整的含Ca、P相的次级微孔层,水热处理后微孔层的亲水性增强,且具有良好的成骨诱导性能。 相似文献
5.
6.
G. P. Li S. X. Guan Q. J. Wang D. Li Y. Y. Liu Z. Q. Hu D. H. Ping 《Metallurgical and Materials Transactions A》1997,28(8):1595-1605
The microstructure of second-phase particles in the Ti-55 alloy (Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd) was studied by scanning electron
microscopy, transmission electron microscopy (TEM), and high-resolution electron microscopy (HREM) observations. The second-phase
particles in the conventional ingot-cast Ti-55 alloy of 1 to 15 μm in diameter and uniform distribution in matrix were observed, where the majority of these particles are elliptical. The
mean free path between the particles is about 46 μm, and the volume fraction (pct) is 2.35. The second-phase particles typically contain Nd, Sn, and O in substantial amounts,
and the content of Nd is the largest in the three elements. The elements Ti, Al, Zr, Mo and Si are depleted in the particles.
The second-phase particle consists of either a dark or bright matrix and some small dark blocks dispersed within the matrix.
Dark blocks match SnO (orthorhombic, a=0.500 nm, b=0.572 nm, and c=1.120 nm), and the matrix consists of a nanocrystalline phase with a stoichiometric Nd3Sn structure having a space group of Pm3m and lattice parameter of a=0.344 nm. The grain size of the nanocrystalline Nd3Sn phase is about 3 to 15 nm. The melting range of the second-phase particle is estimated to be 1042 °C to 1600 °C. The microstructure
of the second-phase particles in the quenched Ti-55 alloy was also studied. Fine and uniform dispersoids (6 to 15 nm in diameter)
were observed in the as-quenched state. Some lenslike particles occur at the grain boundaries, other elliptical particles
appear within the grains, and some particles within the grains form rows which are parallel to the advancing liquid-solid
interface. After annealing at 980 °C (1 to 10 hours), of the as-quenched Ti-55 alloy, coarse particles are 17 to 42 nm in
average diameter, and the growth of the particles is very slow. The dispersoids in the as-annealed Ti-55 alloy are identified
as nanocrystalline Nd5Sn (orthorhombic, Pnmn, a=0.814 nm, b=1.732 nm, and c=0.814 nm) intermetallic compound, and the interface between the Nd5Sn4 phase and the matrix is a typical high-angle grain boundary. 相似文献
7.
采用冷等静压–真空烧结法制备Ti-6Al-4V-2Cr-1Nd合金,然后进行固溶及时效热处理,通过实验与最小错配度理论计算,研究Nd元素对该合金组织细化的影响,并分析细化机理。结果表明,添加1%(质量分数)的稀土元素Nd后,析出相Nd2O3能有效促进晶粒细化。二维错配度的计算结果证明析出相Nd2O3是有效的形核剂,可促进非均匀形核,增加形核率,从而使晶粒细化。通过对合金试样薄区进行高分辨率观察,发现另一种絮状的、非常细小的、弥散分布的Nd2Ti4O11相,由于其界面错配度较低,也可作为非均匀形核的核心,促进形核,起到细化晶粒的作用。 相似文献
8.
9.
Retardation Effect of Rare Earth-Rich Phase to Grain Growth of Ti-5.6Al-4.8Sn-2Zr-1Mo-0.32Si-1Nd High Temperature Alloy 相似文献