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| 1 | Microstructure and tensile properties of low cost titanium alloys at different cooling rate显示文摘Titanium and titanium alloys have several advantages, but the cost of titanium alloys is very expensive compared with the traditional metal materials. This article introduces two new low-cost titanium alloys Ti-2.1Cr-1.3Fe (TCF alloy) and Ti-3Al-2.1Cr-1.3Fe (TACF alloy). In this study, we used Cr-Fe master alloy as one of the raw materials to develop the two new alloys. We introduce the microstructure and tensile properties of the two new alloys from β solution treated with different cooling methods. Optical microscopy (OM), X-ray diffractometry (XRD), and transmission electron microscopy (TEM) were employed to analyze the phase constitution, and scanning electron microscopy (SEM) was used to observe the fracture surfaces. The results indicate that the microstructures consist of β grain boundary and α′ martensite after water quenching (WQ), β matrix and α phase after air cooling (AC) and furnace cooling (FC), respectively. Also, the microstructure is the typical basketweave structures after FC. Of course, athermal ω is also observed by TEM after WQ. The strength increases with decreasing cooling rates and the plasticity is reversed. Because of the athermal ω, the strength and ductility are highest and lowest when the cooling method is WQ. The strength of TACF alloy is higher than the TCF alloy, but the plasticity is lower. The fracture surfaces are almost entirely covered with dimples under the cooling methods of AC and FC. Also, we observe an intergranular fracture area that is generated by athermal ω, although some dimples are observed after WQ. | Wang Guo Hui Songxiao Ye Wenjun Mi Xujun Wang Yongling Zhang Wenjing | 2012 | Rare Metals2012，31，6： | 8 |
| 2 | Relationship between microstructure and tensile properties on a near-β titanium alloy after multidirectional forging and heat treatment显示文摘In this study, a new near-beta titanium alloy, Ti- 4Al-1 Sn-2Zr-5Mo-8V-2.5Cr, was prepared by induction skull melting (ISM) and multidirectional forging. The effect of aging heat treat me rn on microstructure and ten sile properties of the alloy after solution treatment in the twophase (α+β) region was investigated. The microstructure results show that the globular primary ot phase (cxp) and the needle-like secondary y. phase (ots) are precipitated in the P matrix. The size of ots increases with the increase in aging temperature, while the con tent of ots goes up to a peak value and then decreases. The tensile testing results show that the strength increases first and then decreases with the in crease in temperature. The variation of ductility presents the opposite way compared with the trend of strength level. When aged at 500℃, the alloy exhibits an excellebalance of tensile strength (1529 MPa) and elongation (9.22%). And the relative mechanism of sirengthening and toughening was analyzed and discussed. | Zhi-Dan Lu Chang-Jiang Zhang Zhao-Xin Du Jian-Chao Han Shu-Zhi Zhang Fei Yang Yu-Yong Chen | 2019 | Rare Metals2019，38，4： | 8 |
| 3 | 固溶温度对Ti-62A合金拉伸性能和断裂韧性的影响显示文摘Ti-62A合金是一种新型高强高韧损伤容限型钛合金,研究了固溶温度对Ti-62A合金30 mm厚板材的显微组织、拉伸性能以及断裂韧性的影响规律。研究结果表明:Ti-62A合金Φ720 mm铸锭经单相区和两相区多道次大变形轧制后所得的30 mm厚板材组织为典型的片层组织,由片层状的α相和β转变组织构成,组织均匀,片层状α相平均宽度约为2.5μm,长度在40~65μm之间。两相区固溶+时效处理后,合金的组织类型为片层状组织,即片层状的初生α相(αp)相与β转变组织,随固溶温度升高,合金中的初生α相(αp)相含量显著减少,β转变组织逐渐增多,次生α相(αs)片层宽度增大,同时合金的强度下降,塑性上升,当接近相变点时这种趋势变缓。单相区固溶+时效处理获得魏氏组织,晶粒粗大,晶界平直而清晰,其拉伸强度高于920℃和940℃固溶时的片层组织,但塑性显著降低;与900℃固溶时相比强度和塑性均降低。合金的断裂韧性随固溶温度的上升而逐渐升高,单相区固溶并时效后的魏氏组织的断裂韧性明显优于两相区固溶并时效后的片层组织。 | 孙明 叶文君 惠松骁 于洋 | 2012 | 稀有金属2012，36，1： | 5 |
| 4 | Tensile and fracture properties of Ti-62A alloy plate with different microstructures显示文摘Ti-62A alloy plates with three different types of microstructure, fully equiaxed, bimodal, and Widmanst tten, were obtained by various heat treatments to investigate the effects of microstructure on the tensile and fracture properties at room temperature. The results reveal that Widmanst tten microstructure exhibits good damage tolerance behavior considering strength, fracture toughness, and fatigue crack growth behavior, while the bimodal microstructure shows good comprehensive properties considering the plasticity synthetically. Optical microscopy (OM) and scanning electron microscopy (SEM) microstructure analyses on fracture and fatigue crack path demonstrate that the dependence of mechanical properties and fatigue crack growth behavior on microstructural feature are attributed to the α lamellae width and the α colony size. | LIU Rui HUI Songxiao YE Wenjun YU Yang FU Yanyan SONG Xiaoyun DENG Xiguang | 2012 | Rare Metals2012，31，5： | 5 |
| 5 | 再次热处理对TC4-DT钛合金板材组织及性能的影响显示文摘经β退火后的TC4-DT钛合金板材,其强度未达到AMS 4905标准要求。为此,在β单相区和α+β两相区分别又进行了固溶(冷却方式分别为空冷和水冷)加时效处理。观察了经不同工艺热处理后板材的显微组织,并对其室温拉伸性能、断裂韧性进行了测试分析。结果表明,再次热处理后板材组织未发生明显改变。与空冷态相比,水冷后的次生α更细小。与原始β退火相比,水冷后板材的拉伸强度、屈服强度增加约70 MPa,同时断裂韧性略有减小,延伸率略降至8.5%。经再次热处理后,板材的强度和断裂韧性均达到标准要求。 | 谢英杰 付文杰 周玉川 陈钧伟 王蕊宁 张清 | 2015 | 钛工业进展2015，32，2： | 1 |
| 6 | Ti-62231S钛合金热变形本构方程的研究显示文摘本文利用Gleeble-3800热模拟试验机,通过Ti-62231S钛合金材料在945℃~975℃温度范围内,应变速率为0.01~1s-1,变形量为70%进行了等温恒应变速率压缩实验。分析了Ti-62231S在该变形条件下的真应力-应变曲线,得出了变形温度和应变速率对流变应力的影响规律,建立了适合于Ti-62231S钛合金材料的热变形本构方程。误差分析表明所建立的本构方程与实验值吻合较好,为制定该合金的锻造、轧制等热变形工艺提供了理论基础。 | 张伟 张雪敏 雒水会 黄拓 贾栓孝 | 2020 | 世界有色金属2020，45，12： | 0 |
| 7 | Ti-62A合金动态软化速率异常的热力学解释及其应变补偿本构方程显示文摘使用Gleeble-3800热模拟试验机研究了Ti-62A合金在变形温度为800~950℃、应变速率为0.001~10 s^-1条件下的热压缩变形行为。结果表明,随着变形温度的提高出现Ti-62A合金的动态软化率降低的反常现象。(α+β)双相钛合金中Mo、Cr等β稳定元素的原子活性随着温度的升高而逐渐降低和β相比例增大,Jmatpro软件的热力学计算表明(α+β)双相钛合金的这一现象与此有密切关系。而α钛合金和β钛合金出现动态软化速率降低,与加工温度升高β相比例增大的关系更密切。从800℃升高到950℃,Ti-62A合金中β相的比例由32.1%提高到84.3%,Mo、Cr活性的降幅均达到64%。这些因素使变形过程中Ti-62A合金的晶界迁移速度和动态软化速率均随变形温度升高而降低,其950℃的真应力-应变曲线多为典型的动态回复型。α相的含量随着变形温度的提高而降低,且在较高的变形温度下β相的晶粒尺寸也较为粗大。构建的基于应变补偿的Ti-62A合金Arrhenius变形抗力模型,能较好地预测合金的流变应力行为,其相关系数R达到0.990,预测值与实测值的平均相对误差为8.983%。 | 王敬忠 丁凯伦 杨西荣 刘晓燕 | 2020 | 材料研究学报2020，34，6： | 0 |
| 8 | Ti-62A钛合金多道次降温热变形行为研究显示文摘在Gleeble-3800型热模拟机上对Ti-62A合金进行了不同变形参数的多道次热模拟试验,利用金相显微镜和透射电子显微镜观察了Ti-62A合金多道次降温条件下材料的变形及微观组织演化行为。结果表明:流变应力随着变形温度的降低呈阶梯升高,变形温度对Ti-62A合金的弹性模量几乎没有影响;β单相区变形过程中动态回复为主要软化机制,α+β双相区变形,主要的软化机制为次生α相的部分动态再结晶和形变诱导的β→α相的转变;微观组织均由β基体和不同取向的次生α相构成。随着压缩道次的增加,次生α相从细小致密的针状变为粗大的片层状,并与晶界成一定角度。次生针状α相在晶界处形核,向晶粒内部生长,使原β晶界破碎。随着变形道次增加和变形温度降低,合金中次生α相分布规律性变差。经1050-1010℃温度区间变形,β相基体内部的针状α相呈相互垂直关系,构成网格形态;而经1050-930℃温度区间变形,晶内仅出现一种相互平行的片层状α相变体。 | 丁凯伦 王敬忠 杨西荣 刘晓燕 罗雷 李磊 | 2021 | 稀有金属2021，45，8： | 0 |
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