Transactions of Nonferrous Metals Society of China最新文献

英文中文

Creep behavior and microstructure evolution of TiAl alloys synergisticallymicro-alloyed with C and Y2O3 at different temperatures C和Y2O3协同微合金化TiAl合金在不同温度下的蠕变行为及显微组织演变

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China

Pub Date : 2025-10-01 DOI: 10.1016/S1003-6326(25)66882-8

Zhen-quan LIANG , Shu-long XIAO , Ye TIAN , Yun-fei ZHENG , Ying-fei GUO , Li-juan XU , Xiang XUE , Jing TIAN

The microstructure and creep behavior of C/Y₂O₃synergistically micro-alloyed high-Al and low-Al TiAl alloys prepared by induction skull melting (ISM) technology were investigated by advanced electron microscopy. Microstructure analysis shows that Y₂O₃ particles are dispersed in both alloys; element C is dissolved in low-Al alloys as solid solution, while it exists as Ti₂AlC particles within lamellae in high-Al alloys. Additionally, high-density nanotwins are generated in high-Al alloys. Creep data show that C/Y₂O₃ micro-alloying significantly enhances creep resistance of TiAl alloys. This benefits from the dispersion strengthening of Y₂O₃ particles, precipitation hardening of dynamically precipitated Ti₃AlC particles and lamellar stabilization caused by dissolved C atoms or Ti₂AlC particles. This strategy causes a more significant improvement on creep resistance of high-Al TiAl alloys, which is attributed to extra twin strengthening effect. At 775-850 °C, these alloys fracture in mixed ductile-brittle mode, but the fracture characteristics change with the increase of temperature.

采用先进的电子显微镜研究了感应颅骨熔炼（ISM）技术制备的C/ y2o3协同微合金化高铝和低铝TiAl合金的显微组织和蠕变行为。显微组织分析表明，两种合金中均有分散的Y2O3颗粒；C元素在低al合金中以固溶体的形式存在，而在高al合金中以Ti2AlC颗粒的形式存在。此外，在高铝合金中产生高密度纳米孪晶。蠕变数据表明，C/Y2O3微合金化显著提高了TiAl合金的抗蠕变性能。这得益于Y2O3颗粒的弥散强化、动态析出Ti3AlC颗粒的析出硬化以及溶解的C原子或Ti2AlC颗粒引起的层状稳定。这种策略使高al TiAl合金的抗蠕变性能得到了更显著的提高，这是由于额外的孪晶强化效应。在775 ~ 850℃时，合金呈韧脆混合断裂，但断裂特征随温度的升高而变化。

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引用次数: 0

Compressive mechanical behavior and microstructure evolution of Ti-5.7Al-2.9Nb-1.8Fe-1.6Mo-1.5V-1Zr alloy under extreme conditions Ti-5.7Al-2.9Nb-1.8Fe-1.6Mo-1.5V-1Zr合金在极端条件下的压缩力学行为及组织演变

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China

Pub Date : 2025-10-01 DOI: 10.1016/S1003-6326(25)66883-X

Wen-fei PENG , Chao-qi DONG , Qiao-dong HUANG , Xiao-feng WANG , Oleksandr MOLIAR

Compressive mechanical behavior and microstructure evolution of Ti-5.7Al-2.9Nb-1.8Fe-1.6Mo-1.5V-1Zr alloy under extreme conditions were systematically investigated. The results show that strain rate and temperature have a significant influence on the mechanical behavior and microstructure. The alloy exhibits a positive strain rate sensitivity and negative temperature sensitivity under all temperature and strain rate conditions. The hot- rolled alloy is composed of a bimodal structure including an equiaxed primary α_p phase and a transformed β phase. After compression deformation, the bimodal deformed structural features highly rely on the temperature and strain rate. At low temperature and room temperature, the volume fraction and size of α_p phase decrease with increasing temperature and strain rate. At high temperature, the volume fraction of the α phase is inversely correlated with temperature. A modified Johnson-Cook constitutive model is established, and the predicted results coincide well with the experimental results.

系统研究了Ti-5.7Al-2.9Nb-1.8Fe-1.6Mo-1.5V-1Zr合金在极端条件下的压缩力学行为和显微组织演变。结果表明，应变速率和温度对合金的力学行为和显微组织有显著影响。该合金在所有温度和应变率条件下均表现为正应变率灵敏度和负温度灵敏度。热轧合金由双峰组织组成，包括一个等轴初生αp相和一个转变的β相。压缩变形后的双峰变形结构特征高度依赖于温度和应变速率。在低温和室温下，αp相的体积分数和尺寸随温度和应变速率的升高而减小。在高温下，α相的体积分数与温度成反比。建立了改进的Johnson-Cook本构模型，预测结果与实验结果吻合较好。

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引用次数: 0

Effect of joint coalescence coefficient on rock bridge formation of slope based on finite difference method 基于有限差分法的节理聚结系数对边坡岩桥形成的影响

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China

Pub Date : 2025-10-01 DOI: 10.1016/S1003-6326(25)66892-0

Su LI, Yi TANG, Hang LIN

A method combining finite difference method (FDM) and k-means clustering algorithm which can determine the threshold of rock bridge generation is proposed. Jointed slope models with different joint coalescence coefficients(k) are constructed based on FDM. The rock bridge area was divided through k-means algorithm and the optimal number of clusters was determined by sum of squared errors (SSE) and elbow method. The influence of maximum principal stress and stress change rate as clustering indexes on the clustering results of rock bridges was compared by using Euclidean distance. The results show that using stress change rate as clustering index is more effective. When the joint coalescence coefficient is less than 0.6, there is no significant stress concentration in the middle area of adjacent joints, that is, no generation of rock bridge. In addition, the range of rock bridge is affected by the coalescence coefficient (k), the relative position of joints and the parameters of weak interlayer.

提出了一种结合有限差分法和k均值聚类算法确定岩桥生成阈值的方法。基于FDM，建立了不同节理聚结系数(k)的节理边坡模型。采用k-means算法划分岩桥区域，采用误差平方和（SSE）和弯头法确定最优簇数。采用欧几里得距离比较了最大主应力和应力变化率作为聚类指标对岩桥聚类结果的影响。结果表明，以应力变化率作为聚类指标更为有效。当节理聚结系数小于0.6时，相邻节理中间区域无明显应力集中，即不产生岩桥。此外，聚结系数(k)、节理相对位置和弱夹层参数对岩桥范围也有影响。

引用次数: 0

Efficient recovery of metallic aluminum from hazardous secondary aluminum dross via ball-milling and supergravity-enhanced separation 球磨-超重分离法从危险二次铝渣中高效回收金属铝

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China

Pub Date : 2025-10-01 DOI: 10.1016/S1003-6326(25)66895-6

Zeng-wu WANG, Jin-tao GAO, Xi LAN, Zhan-cheng GUO

Secondary aluminum dross (SAD), a by-product of aluminum extraction from primary aluminum dross, contains metallic aluminum particles coated with dense oxidized films, complicating the recovery of metallic aluminum using traditional methods. Ball-milling was employed to break and alter the structure of these oxidized films. The results indicated that the films became thinner and stripped away, exposing the aluminum surface. Based on the in-situ observation of the structure evolution of milled SAD particles with temperature, the metallic aluminum liquid was efficiently recovered from SAD at 680 °C via supergravity-enhanced separation, where the recovery ratio and mass fraction of Al in the separated aluminum phase were up to 95.72% and 99.10 wt.%, respectively. Moreover, the tailings can be harmlessly utilized in refractory, cement and ceramic fields with subsequent treatment, such as denitrification, dechlorination, and fluoride fixation.

二次铝渣（SAD）是原铝渣提铝的副产物，它含有金属铝颗粒，表面包裹着致密的氧化膜，使传统的金属铝回收方法复杂化。采用球磨法粉碎和改变这些氧化膜的结构。结果表明，薄膜变薄并剥离，露出铝表面。通过对破碎后的SAD颗粒结构随温度变化的现场观察，发现在680℃时，采用超重强化分离方法可有效回收金属铝液，分离铝相中Al的回收率和质量分数分别达到95.72%和99.10 wt.%。尾矿经脱氮、脱氯、固氟等后续处理，可无害化利用于耐火材料、水泥、陶瓷等领域。

引用次数: 0

Regeneration of battery grade FePO4 and Li2CO3 from Al/F-bearing spent LiFePO4/C powder 含Al/ f的废LiFePO4/C粉末再生电池级FePO4和Li2CO3

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China

Pub Date : 2025-10-01 DOI: 10.1016/S1003-6326(25)66897-X

Ye-hui-zi WU, Kang-gen ZHOU, Chang-hong PENG, Kui YI, Jing-kun DENG, Zai-rong QIU, Wei CHEN, Ke-jing ZHANG

A sustainable approach for recovering battery grade FePO₄ and Li₂CO₃ from Al/F-bearing spent LiFePO₄/C powder was proposed, including acid leaching, fluorinated coordination precipitation, homogeneous precipitation, and high-temperature precipitation. Under the optimal conditions, the leaching efficiencies of Li, Fe, P, Al, and F were 97.6%, 97.1%, 97.1%, 72.5%, and 63.3%, respectively. The effects of different parameters on the removal of Al/F impurities were systematically evaluated, indicating about 99.4% Al and 96.4% F in the leachate were precipitated in the form of Na₃Li₃Al₂F₁₂, and their residual concentrations were only 0.0124 and 0.328 g/L, respectively, which could be directly used to prepare battery grade FePO₄ (99.68% in purity). Lithium in the Al/F-bearing residue could be extracted through CaCO₃-CaSO₄ roasting followed by acid leaching, ultimately obtaining 99.87% purity of Li₂CO₃. The recovery rates of Li and Fe were 96.88% and 92.85%, respectively. An economic evaluation demonstrated that the process was profitable.

提出了从含Al/ f的废LiFePO4/C粉末中回收电池级FePO4和Li2CO3的可持续方法，包括酸浸、氟化配位沉淀、均匀沉淀和高温沉淀。在最优条件下，Li、Fe、P、Al和F的浸出率分别为97.6%、97.1%、97.1%、72.5%和63.3%。系统评价了不同参数对Al/F杂质去除率的影响，结果表明，渗滤液中99.4%的Al和96.4%的F以Na3Li3Al2F12的形式沉淀，其残留浓度分别仅为0.0124和0.328 g/L，可直接用于制备电池级FePO4（纯度为99.68%）。含Al/ f渣中的锂可通过CaCO3-CaSO4焙烧后酸浸提取，最终获得纯度为99.87%的Li2CO3。Li和Fe的回收率分别为96.88%和92.85%。经济评估表明，该工艺是有利可图的。

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引用次数: 0

Effect of extrusion temperature on dynamic recrystallization behavior and mechanical properties of flame-retardant Mg-Al-Ca-Zn-Sn-Mn alloy 挤压温度对阻燃Mg-Al-Ca-Zn-Sn-Mn合金动态再结晶行为及力学性能的影响

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China

Pub Date : 2025-10-01 DOI: 10.1016/S1003-6326(25)66880-4

Xi-zao WANG , Tian-jiao LUO , Qiu-yan HUANG , Tian-yu LIU , Ying-ju LI , Ce ZHENG , Shuang GUO , Yuan-sheng YANG

The effect of extrusion temperature on the dynamic recrystallization behavior and mechanical properties of the flame-retardant Mg-6Al-3Ca-1Zn-1Sn-Mn (wt.%) alloy was investigated. The observed dynamic recrystallization mechanisms in the alloy include continuous dynamic recrystallization (CDRX) and particle simulated nucleation (PSN) during hot extrusion. A significant increase in yield strength, from 218 to 358 MPa, representing a 140 MPa increase, is achieved by decreasing the extrusion temperature. The strengthening mechanisms were analyzed quantitatively, with the enhanced strength primarily attributed to grain boundary and dislocation strengthening. The plasticity mechanism was analyzed qualitatively, and the increase in the volume fraction of unDRXed grains caused by the decrease in extrusion temperature leads to an increase in the number of {102} tensile twins during the tensile deformation, resulting in a reduction in plasticity.

研究了挤压温度对阻燃型Mg-6Al-3Ca-1Zn-1Sn-Mn （wt.%）合金动态再结晶行为和力学性能的影响。观察到的合金动态再结晶机制包括热挤压过程中的连续动态再结晶（CDRX）和颗粒模拟形核（PSN）。通过降低挤压温度，屈服强度从218 MPa显著提高到358mpa，增加了140 MPa。定量分析了强化机理，认为强化主要是晶界强化和位错强化。定性分析了塑性机理，发现挤压温度降低导致unDRXed晶粒体积分数增加，导致拉伸变形过程中{102}拉伸孪晶数量增加，塑性降低。

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引用次数: 0

Effects of different bionic strengthening technologies on fatigue crack growth behavior of AZ31B magnesium alloy TIG-welded joints 不同仿生强化技术对AZ31B镁合金tig焊接接头疲劳裂纹扩展行为的影响

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China

Pub Date : 2025-10-01 DOI: 10.1016/S1003-6326(25)66881-6

Yong-heng JIANG , Xin-lei QIU , Zheng-qiang ZHANG , Zi-heng SONG , Sheng-guang DAI , Xue-lei WANG , Chun WU , Chao MENG

With the aim of improving the fatigue properties of Mg alloy welded joints under cyclic loading, the effects of laser bionic treatment and ultrasonic impact bionic treatment on the fatigue crack growth (FCG) behavior of AZ31B Mg alloy TIG-welded joints were studied and compared. The results show that bionic treatment refines the grains on the joint surface and improves the microhardness. In the crack stable growth stage, both bionic samples exhibit a lower FCG rate and a higher FCG resistance. The two bionic treatment methods reduce the probability of crack initiation and partially promote crack deflection, providing a new approach for improving the FCG behavior of welded joints.

为了提高镁合金焊接接头在循环载荷下的疲劳性能，研究并比较了激光仿生处理和超声仿生冲击处理对AZ31B镁合金tig焊接接头疲劳裂纹扩展行为的影响。结果表明：仿生处理使接头表面晶粒细化，显微硬度提高；在裂纹稳定生长阶段，两种仿生试样均表现出较低的FCG速率和较高的抗FCG能力。两种仿生处理方法降低了裂纹起裂概率，部分促进了裂纹挠曲，为改善焊接接头的FCG性能提供了新的途径。

引用次数: 0

Improved resistance to creep and underlying mechanisms in TiB/(TA15-Si) composites with network structure 网状TiB/(TA15-Si)复合材料抗蠕变性能的提高及其机理

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China

Pub Date : 2025-10-01 DOI: 10.1016/S1003-6326(25)66885-3

Shuai WANG , Rui ZHANG , Ming JI , Feng-bo SUN , Zi-shuo MA , Qi AN , Lu-jun HUANG , Lin GENG

To assess the high-temperature creep properties of titanium matrix composites for aircraft skin, the TA15 alloy, TiB/TA15 and TiB/(TA15-Si) composites with network structure were fabricated using low-energy milling and vacuum hot pressing sintering techniques. The results show that introducing TiB and Si can reduce the steady-state creep rate by an order of magnitude at 600 °C compared to the alloy. However, the beneficial effect of Si can be maintained at 700 °C while the positive effect of TiB gradually diminishes due to the pores near TiB and interface debonding. The creep deformation mechanism of the as-sintered TiB/(TA15-Si) composite is primarily governed by dislocation climbing. The high creep resistance at 600 °C can be mainly attributed to the absence of grain boundary α phases, load transfer by TiB whisker, and the hindrance of dislocation movement by silicides. The low steady-state creep rate at 700 °Cis mainly resulted from the elimination of grain boundary α phases as well as increased dynamic precipitation of silicides and α₂.

为了研究飞机蒙皮用钛基复合材料的高温蠕变性能，采用低能铣削和真空热压烧结技术制备了具有网状结构的TA15合金、TiB/TA15和TiB/(TA15- si)复合材料。结果表明，在600℃时，TiB和Si的加入使合金的稳态蠕变速率降低了一个数量级。而在700℃时，Si的有利作用仍能保持，而TiB的积极作用由于TiB附近的孔隙和界面脱粘而逐渐减弱。烧结TiB/(TA15-Si)复合材料的蠕变机制主要由位错爬升控制。在600℃时具有较高的抗蠕变性能，主要原因是晶界α相的缺失、TiB晶须的载荷传递以及硅化物对位错运动的阻碍。700°Cis时稳态蠕变速率低的主要原因是晶界α相的消除以及硅化物和α2的动态析出增加。

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引用次数: 0

Ion coordination affinity and its application in mineral flotation 离子配位亲和及其在矿物浮选中的应用

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China

Pub Date : 2025-10-01 DOI: 10.1016/S1003-6326(25)66893-2

Hong-liang ZHANG , Xin RAO , Chen-yang ZHANG , Jian-hua CHEN , Yang-ge ZHU , Rong WANG , Wei SUN

The ion coordination affinities of the commonly found metal ions were evaluated using DFT calculations. The results indicate that the lowest unoccupied molecular orbital (LUMO) energy of metal ions correlates positively with their binding energies with O(S) ligands, and some metal ions with various valence states also present different affinities. Besides, due to the steric hindrance effects, the mono- and hexa-coordinated metal ions may exhibit different affinities, and the majority of the studied hexa-coordinated metal ions exhibit oxophilicity. These affinity differences perfectly illustrate the activation flotation practice in which the oxyphilic ions are applied to activating oxide minerals, while thiophilic ions are applied to activating sulfide minerals.

常用的金属离子的离子配位亲和用DFT计算进行了评价。结果表明，金属离子的最低未占据分子轨道（LUMO）能与其与O(S)配体的结合能呈正相关，不同价态的金属离子也表现出不同的亲和力。此外，由于空间位阻效应，单配位和六配位金属离子可能表现出不同的亲和性，所研究的六配位金属离子大多数表现出亲氧性。这些亲和度差异很好地说明了活化浮选实践中亲氧离子用于活化氧化矿物，而亲硫离子用于活化硫化矿物。

引用次数: 0

Heterogeneous lamellar structure dominated mechanical properties optimization in ARBed Al alloy laminated metal composites 非均相片层结构主导了ARBed铝合金层合金属复合材料的力学性能优化

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China

Pub Date : 2025-10-01 DOI: 10.1016/S1003-6326(25)66876-2

Tai-qian MO , Hua-qiang XIAO , Cun-hong YIN , Bo LIN , Xue-jian WANG , Kai MA

1060/7050 Al/Al laminated metal composites (LMCs) with heterogeneous lamellar structures were prepared by accumulative roll bonding (ARB), cold rolling and subsequent annealing treatment. The strengthening mechanism was investigated by microstructural characterization, mechanical property tests and in-situ fracture morphology observations. The results show that microstructural differences between the constituent layers are present in the Al/Al LMCs after various numbers of ARB cycles. Compared with rolled 2560-layered Al/Al LMCs with 37.5% and 50.0% rolling reductions, those with 62.5% rolling reductions allow for more effective improvements in the mechanical properties after annealing treatment due to their relatively high mechanical incompatibility across the interface. During tensile deformation, with the increased magnitude of incompatibility in the 2560-layered Al/Al LMC with a heterogeneous lamellar structure, the densities of the geometrically necessary dislocations (GNDs) increase to accommodate the relatively large strain gradient, resulting in considerable back stress strengthening and improved mechanical properties.

采用累积轧制结合（ARB）、冷轧和后续退火工艺制备了具有非均匀层状结构的1060/7050 Al/Al层状金属复合材料（lmc）。通过显微组织表征、力学性能测试和现场断口形貌观察研究了强化机理。结果表明，经过不同次数的ARB循环后，Al/Al lmc的组成层之间存在微观结构差异。与轧制压下量分别为37.5%和50.0%的2560层Al/Al lmc相比，轧制压下量为62.5%的Al/Al lmc在退火处理后的力学性能得到了更有效的改善，这是由于它们在界面上相对较高的力学不相容性。在拉伸变形过程中，具有非均质层状结构的2560层Al/Al LMC中，随着不相容程度的增加，几何必要位错（GNDs）的密度增加以适应相对较大的应变梯度，从而导致相当大的背应力强化和力学性能的改善。

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