Transactions of Nonferrous Metals Society of China最新文献

英文中文

Enhanced strength-ductility synergy of ultrafine-grained eutectic-dendrite complex structures in zirconium/nickel electron beam welded joints 锆/镍电子束焊接接头中超细晶共晶枝晶复合结构增强的强度-塑性协同作用

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)66889-0

Xin-yan TENG , Guo-qing CHEN , Ge ZHANG , Yang XIANG , Xue-song LENG

Insufficient metallurgical compatibility between Zr and Ni can lead to the formation of brittle welds and introduce thermal stress-related challenges during the electron beam welding process. Through the implementation of beam deflection and vibration, a transformation was achieved in the primary Ni₅Zr dendrite structure, transitioning from a mass into a layered configuration, consequently resulting in the formation of an ultrafine-grained eutectic-dendrite complex structure. It is revealed that the enhanced strength-ductility synergy of this structure significantly contributes to the high tensile strength and improved plasticity observed in the welded joints. As a result, the welding cracks are effectively mitigated, and notable advancements are achieved in the mechanical properties of Zr/Ni joints, elevating the tensile strength of the joints from 36.4 to 189 MPa. This research not only highlights the potential of this technique in enhancing the strength and ductility of Zr/Ni welded joints but also serves as a valuable reference for future investigations involving welding applications of dissimilar metals.

Zr和Ni之间的冶金相容性不足会导致焊缝脆性的形成，并在电子束焊接过程中引入与热应力相关的挑战。通过施加光束偏转和振动，Ni5Zr初生枝晶结构发生转变，由块状转变为层状结构，形成超细晶共晶枝晶复合结构。结果表明，这种结构增强的强度-塑性协同作用显著有助于提高焊接接头的抗拉强度和塑性。结果表明，焊接裂纹得到有效缓解，Zr/Ni接头的力学性能得到显著改善，接头的抗拉强度从36.4 MPa提高到189 MPa。该研究不仅突出了该技术在提高Zr/Ni焊接接头强度和延展性方面的潜力，而且为未来研究异种金属焊接应用提供了有价值的参考。

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引用次数: 0

Origin of high strength and good ductility of TiH2-based powder metallurgy titanium alloy with discontinuous lamellar structures 具有不连续层状组织的tih2基粉末冶金钛合金高强度和良好延展性的来源

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)66884-1

Hai-rui ZHANG , Hong-zhi NIU , Chao YANG , Nan XIANG , De-liang ZHANG , Fu-xiao CHEN

A unique discontinuous lamellar microstructure of titanium alloys consisting of lamellar colonies at prior β-Ti grain boundaries and internal interwoven α-laths is prepared by a TiH₂-based powder metallurgy method. The α-variants get various crystallographic orientations and become discontinuous during vacuum annealing at 700 °C. Remarkably, nanoscale phaseδ-TiH compound layers are generated between α-laths and β-strips, so that dislocations are piledup at the α/δ/β interfaces during tensile deformation. This leads to dislocation slips being confined to individual α-laths, with different 〈a〉 slips and particularly pyramidal 〈c+a〉 slips being activated. The efficiency of wavy slip is promoted and the work hardening rate is enhanced. Finally, the combined effect of dispersed micro-shear bands and lath distortions is considered contributive for alleviating the stress concentration at grain boundaries, resulting in a high-promising synergy of enhanced ultimate tensile strength of 1080 MPa and good elongation to fracture of 13.6%.

采用tih2基粉末冶金法制备了一种由β-Ti晶界上的层状集落和内部交织的α-板条组成的独特的非连续层状钛合金显微组织。在700℃真空退火过程中，α-变异体出现了不同的晶体取向和不连续。在拉伸变形过程中，α-板条和β-条条之间形成纳米级相δ- tih复合层，使位错在α/δ/β界面处堆积。这导致位错滑移局限于单个α-板条，不同的< a +a >滑移，特别是锥体< c+a >滑移被激活。提高了波滑效率，提高了加工硬化率。最后，分散的微剪切带和板条变形的共同作用被认为有助于缓解晶界应力集中，从而提高了1080 MPa的极限抗拉强度和13.6%的良好断裂伸长率。

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引用次数: 0

Preparation of high-strength and high-ductility Mg-Gd-Y-Zn-Zr alloy via deformation at low temperature and small extrusion ratio 低温小挤压比变形制备高强高塑性Mg-Gd-Y-Zn-Zr合金

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)66879-8

Ya-yun HE , Rui GUO , Xi ZHAO , Zhi-min ZHANG

A method of pre-regulating the lamellar long-period stacking ordered (LPSO) phase was introduced to enhance the hot plasticity of rare earth magnesium alloys. Additionally, low-temperature extrusion was used to achieve a comprehensive improvement of alloy performance with small deformation, providing a new approach for the preparation of high-performance large components. The strengthening-toughening mechanism under low-temperature extrusion with an extrusion ratio of 3.6:1 was investigated by comparing the microstructure and performance of pre-regulated Mg-Gd-Y-Zn-Zralloy at three different extrusion temperatures (420, 450, and 480 °C). Results show that the alloy extruded at 420 °C exhibits a yield strength of 341 MPa, tensile strength of 419 MPa, and elongation of 7.2%. The increase in strength is mainly caused by the strong texture and internal dislocation pinning of the undynamic recrystallization (un-DRX)zone, and a lower volume fraction of β dynamic precipitation phase is beneficial to improving the ductility of the alloy.

为了提高稀土镁合金的热塑性，提出了一种预调节片层长周期有序堆积相（LPSO）的方法。此外，采用低温挤压技术在小变形条件下实现了合金性能的全面提高，为高性能大型部件的制备提供了新的途径。通过对比预调节Mg-Gd-Y-Zn-Zralloy在420、450和480℃三种不同挤压温度下的组织和性能，研究了挤压比为3.6:1的低温挤压强化增韧机理。结果表明，在420℃下挤压成形的合金屈服强度为341 MPa，抗拉强度为419 MPa，伸长率为7.2%。强度的提高主要是由非动态再结晶区（undrx）的强织构和内部位错钉住引起的，较低的β动态析出相体积分数有利于提高合金的塑性。

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引用次数: 0

Needle-like χ phase precipitation induced by stacking fault in novelCo-based superalloys 新钴基高温合金中层错引起的针状χ相析出

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)66888-9

Qiu-zhi GAO , Jun-ru WANG , Xu-ming ZHANG , Qing-shuang MA , Song-lin LI , Hui-jun LI , Hong-tao ZHU

To explain the precipitation mechanism of χ phase in Co-based superalloys, the microstructural evolution of Co-Ti-Mo superalloys subjected to aging was investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the needle-like χ phase is mainly composed of D0₁₉-Co₃(Ti, Mo), which is transformed from L1₂-γ′ phase, and a specific orientation relationship exists between them. χ phase is nucleated through the shearing of γ′ phase due to the influence of stacking fault. The crystal orientation relationship between L1₂ and D0₁₉ can be confirmed as {111}_L12//{0001}_D019, and 〈112〉 _L12//〈100〉 _D019. The growth of D0₁₉-χ phase depends on the diffusions of Ti and Mo, and consumes a large number of elements. This progress leads to the appearance of γ′ precipitation depletion zone (PDZ) around D0₁₉-χ phase. The addition of Ni improves the stability of L1₂-γ′ phase and the mechanical properties of Co-based superalloys.

为了解释co基高温合金中χ相的析出机理，采用x射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究了Co-Ti-Mo高温合金时效后的显微组织演变。结果表明：针状χ相主要由L12-γ′相转变而来的D019-Co3（Ti, Mo）组成，两者之间存在特定的取向关系；由于层错的影响，x相通过γ′相的剪切而成核。L12与D019的晶体取向关系为{111}L12//{0001}D019， < 112 > L12// < 100 > D019。D019-χ相的生长依赖于Ti和Mo的扩散，消耗大量的元素。这一进展导致在D019-χ相附近出现γ′降水枯竭带（PDZ）。Ni的加入提高了L12-γ′相的稳定性和co基高温合金的力学性能。

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引用次数: 0

Effect of iron content on microstructures and mechanical properties of new ultra-high strength Al-Zn-Mg-Cu alloys 铁含量对新型超高强度Al-Zn-Mg-Cu合金组织和力学性能的影响

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)66874-9

Xin-yuan XU , Lei JIANG , Xin-biao ZHANG , Ming-hong MAO , Jian-xin XIE

The impact of Fe content on the microstructures and mechanical properties of an ultra-high strength aluminum alloy, namely, Al-10.50Zn-2.35Mg-1.25Cu-0.12Cr-0.1Mn-0.1Zr-0.1Ti, was investigated. It is found that the increase of Fe content leads to a notable rise in the volume fraction of microscale secondary phases, including (Cu, Fe, Mn, Cr)Al₇, σ phase (composed of Al, Zn, Mg, and Cu elements), and Al₃(Zr, Ti). The formation of these secondary phases results in the depletion of certain phase-forming elements, thereby significantly reducing the quantity of strengthening phases. Fe imposes minimal impact on tensile strength, but it can significantly alter the elongation (δ). For instance, the average elongation of the alloy with 0.18 wt.% Fe (δ=4.5%) is less than half that of the alloy with Fe less than 0.1 wt.% (δ=9.9%-10.9%). The reduction in elongation is attributed to the combined effects of the formation of coarse secondary phases and the diminished quantity of strengthening phases around these coarse phases.

研究了Fe含量对Al-10.50Zn-2.35Mg-1.25Cu-0.12Cr-0.1Mn-0.1Zr-0.1Ti超高强铝合金组织和力学性能的影响。结果表明，随着Fe含量的增加，微观二次相（Cu、Fe、Mn、Cr）Al7、σ相（Al、Zn、Mg、Cu元素组成）和Al3（Zr、Ti）的体积分数显著增加。这些次生相的形成导致某些相形成元素的消耗，从而大大减少了强化相的数量。铁对拉伸强度的影响很小，但对伸长率（δ）的影响很大。例如，含铁0.18 wt.% （δ=4.5%）合金的平均伸长率不到含铁0.1 wt.% （δ=9.9% ~ 10.9%）合金的一半。伸长率的降低是由于粗次生相的形成和这些粗相周围强化相数量的减少共同作用的结果。

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引用次数: 0

MIL-100(Fe) decorated TiO2 for robust hydrogen storage in magnesium hydride MIL-100（Fe）修饰TiO2在氢化镁中的储氢性能

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)66891-9

Ren ZHOU , Li WANG , Tao ZHONG , Shuai LI , Dong-qiang GAO , Fu-ying WU , Liu-ting ZHANG

To modify the stable thermodynamics and poor kinetics of magnesium hydride (MgH₂) for solid-state hydrogen storage, MIL-100(Fe) was in situ fabricated on the surfaces of TiO₂ nano-sheets (NS) by a self-assembly method, and the prepared TiO₂ NS@MIL-100(Fe) presents an excellent catalytic effect on MgH₂. The MgH₂+7wt.%TiO₂ NS@MIL-100(Fe) composite can release hydrogen at 200 °C, achieving a decrease of 150 °C compared to pure MgH₂. Besides, the activation energy of dehydrogenation is decreased to 70.62 kJ/mol and 4 wt.% H₂ can be desorbed within 20 min at a low temperature of 235 °C. Under conditions of 100 °C and 3 MPa, MgH₂+7wt.%TiO₂ NS@MIL-100(Fe) absorbs 5 wt.% of H₂ in 10 min. Surprisingly, 6.62 wt.% reversible capacity is maintained after 50 cycles. The modification mechanism is confirmed that the presence of oxygen vacancies and the synergistic effect of multivalent titanium in TiO₂ NS@MIL-100(Fe) greatly enhance the kinetic and thermodynamic properties of MgH₂.

为了改善氢化镁（MgH2）固态储氢热力学稳定、动力学差的缺点，采用自组装方法在TiO2纳米片（NS）表面原位制备MIL-100(Fe)，制备的TiO2 NS@MIL-100（Fe）对MgH2表现出优异的催化作用。MgH2 + 7 wt。%TiO2 NS@MIL-100（Fe）复合材料可以在200℃时释放氢气，与纯MgH2相比降低了150℃。在235℃的低温条件下，脱氢活化能降低到70.62 kJ/mol，在20 min内可脱氢4 wt %。在100℃和3mpa条件下，MgH2+7wt。%TiO2 NS@MIL-100（Fe）在10min内吸附5wt .%的H2。令人惊讶的是，在50次循环后，可逆容量保持在6.62 wt.%。改性机理证实了TiO2 NS@MIL-100（Fe）中氧空位的存在和多价钛的协同作用极大地增强了MgH2的动力学和热力学性能。

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引用次数: 0

Microstructure, mechanical properties and corrosion behavior of Zr-2.5Nb alloy prepared by laser powder bed fusion 激光粉末床熔合法制备Zr-2.5Nb合金的组织、力学性能及腐蚀行为

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)66887-7

Yun-lei HUANG , Vyacheslav TROFIMOV , Feng LIU , Ming YAN , Jie ZHAN , Hui-xia LI , Da ZENG , Yong-qiang YANG , Chang-hui SONG

This study devoted to optimize the laser powder bed fusion (LPBF) parameters for the preparation of Zr-2.5Nb alloys, and was focused on power of incident laser beam and its scanning speed. The microstructure, mechanical and corrosion properties of samples prepared at different laser powers were investigated. The results show that high quality samples were obtained with the relative densityover 99%, ultimate tensile strength of 980 MPa, and the elongation at fracture of 14.18%. At a scanning speed of 1400 mm/s, with increasing laser power from 120 to 180 W, two transformation processes: α’ martensite coarsening and transition from an acicular into a zigzag structure (β→α’/α→α+β) occurred. Densification and α’ martensite transition improved ductility and corrosion resistance at optimal value of the laser power while lower or higher laser power resulted in decreasing the ductility and corrosion resistance because of unfused particles and pores. Increasing β-Zr amount and size decreased the tensile strength due to the dislocation movement. Passive films, which were spontaneously formed at different laser powers, possessed an optimum corrosion resistance at the laser power of 160 W.

研究了激光粉末床熔合制备Zr-2.5Nb合金的工艺参数，重点研究了入射激光束功率和扫描速度。研究了不同激光功率下制备样品的显微组织、力学性能和腐蚀性能。结果表明：获得了相对密度大于99%、极限抗拉强度为980 MPa、断裂伸长率为14.18%的优质试样。当扫描速度为1400 mm/s，激光功率从120 W增加到180 W时，发生了α′马氏体粗化和由针状向锯齿状（β→α′/α→α+β）结构转变的两个转变过程。当激光功率达到最佳值时，致密化和α′马氏体转变提高了合金的塑性和耐蚀性，而较低或较高的激光功率由于未融合的颗粒和气孔导致合金的塑性和耐蚀性降低。随着β-Zr用量和尺寸的增加，由于位错的移动，拉伸强度降低。在不同激光功率下自发形成的钝化膜，在激光功率为160 W时具有最佳的耐腐蚀性能。

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引用次数: 0

Influencing mechanism of laser specific energy on tribological properties of high performanceTi-Al/WCcompositecoating 激光比能量对高性能ti - al / wco复合涂层摩擦学性能的影响机理

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)66886-5

Xin-meng SUI , Yi-tao WENG , Jian LU , Lin ZHANG , Wei-ping ZHANG

Laser specific energy significantly impacts the quality of composite coatings. Ti-Al/WCcoatings were prepared on the TC21 alloy through laser cladding with specific energy ranging from 66.7 to 133.3 J/mm². The results indicate that the composite coatings primarily comprised Ti₂AlC, α₂-Ti₃Al, γ-TiAl, TiC, and W phases. A gradual increase in the relative intensity of the diffraction peaks of Ti₂AlC, α₂-Ti₃Al, and TiCappeared with the increase of specific energy. When the specific energy was 116.7 J/mm^b the Ti-Al/WC coated alloy achieved a maximum micro- hardness of HV_0.2 766.3, which represented an increase of 1.96 times compared with TC21 alloy, and the minimum wear rate decreased dramatically. Much improvement in tribological properties was attained through the fine-grained strengthening of the (α₂+γ) matrix and the dispersion strengthening of self-lubricating Ti₂AlC and intertwining TiC. This study provides valuable insights for the development of high-performance Ti-Al composite coatings.

激光比能对复合涂层的质量有重要影响。采用激光熔覆的方法在TC21合金表面制备了Ti-Al/ wcu涂层，其比能范围为66.7 ~ 133.3 J/mm2。结果表明，复合镀层主要由Ti2AlC、α2-Ti3Al、γ-TiAl、TiC和W相组成。随着比能的增大，Ti2AlC、α2-Ti3Al和tic衍射峰的相对强度逐渐增大。当比能为116.7 J/mmb时，Ti-Al/WC涂层合金的最大显微硬度为HV0.2 766.3，比TC21合金提高了1.96倍，最小磨损率显著降低。通过（α2+γ）基体的细晶强化和自润滑Ti2AlC和缠结TiC的弥散强化，提高了摩擦磨损性能。该研究为高性能钛铝复合涂层的发展提供了有价值的见解。

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引用次数: 0

Erosion and diffusion kinetics of PbTe in selenium melts PbTe在硒熔体中的侵蚀和扩散动力学

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)66896-8

Lang LIU , Ji-lin HE , Xian-jun LEI , Huan LUO , Guo-zheng ZHA , Ru-yi JI , Wen-long JIANG , Bin YANG , Bao-qiang XU

The erosion process and kinetics of PbTe particles in a selenium melt were investigated. The results reveal that the limiting step of the reaction is controlled by product layer diffusion and the interfacial chemical reaction at low temperatures (573, 583, and 593 K), but the limiting step is controlled by boundary layer diffusion at high temperatures (603 and 613 K). The Se- and Te-atom diffusion in the product layer becomes unbalanced as the product layer thickens, with Kirkendall voids generating in the product layer accelerating PbTe particle erosion. After the PbTe impurities in the selenium melt evolve into PbSe and Te, Teis evenly distributed in the selenium melt owing to the solubility of Se and Te. This study serves to clarify the evolution behavior of PbTe impurities in the selenium melt and the reason that Te often occurs in Se.

研究了PbTe颗粒在硒熔体中的侵蚀过程和动力学。结果表明：低温（573,583和593 K）反应的极限步由产物层扩散和界面化学反应控制，高温（603和613 K）反应的极限步由边界层扩散控制。随着产物层厚度的增加，Se和te原子在产物层中的扩散变得不平衡，产物层中产生的Kirkendall空洞加速了PbTe粒子的侵蚀。硒熔体中的PbTe杂质演化为PbSe和Te后，由于Se和Te的溶解度，Te在硒熔体中均匀分布。本研究旨在阐明PbTe杂质在硒熔体中的演化行为，以及Te经常出现在Se中的原因。

引用次数: 0

Synergistic effect of Er and Si on corrosion resistance of peak-aged AlZnMgCu alloy Er和Si对峰时效AlZnMgCu合金耐蚀性的协同效应

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)66875-0

Shang-shang LIANG , Sheng-ping WEN , Ke-hong GUO , Bao-sheng LIU , Yong HU , Wu WEI , Xiao-lan WU , Hui HUANG , Kun-yuan GAO , Xiang-yuan XIONG , Zuo-ren NIE

The corrosion resistance and mechanical properties of peak-aged AlZnMgCu alloys containing Si and Er elements were investigated with hardness test, tensile test, intergranular corrosion test, exfoliation corrosion test and transmission electron microscopy. The results indicate that peak-aged AlZnMgCuSiEr alloy is strengthened by co-precipitation of η′ phases and nano-sized GPB-II zones. The yield strength of the AlZnMgCu alloy is increased by 38.5 MPa and the elongation is increased by 4.5%. At the same time, the corrosion resistance of the AlZnMgCuSiEr alloy is enhanced due to the synergistic effect of Er and Si. The maximum intergranular corrosion (IGC) depth decreases from 264.2 to 9.9 μm. The fundamental reason is that the co-addition of Si and Er regulates the evolution of precipitated phases in grains and at grain boundaries.

采用硬度试验、拉伸试验、晶间腐蚀试验、剥落腐蚀试验和透射电镜等研究了含Si、Er元素的峰时效AlZnMgCu合金的耐蚀性能和力学性能。结果表明，η′相的共析出和纳米级GPB-II区共同强化了AlZnMgCuSiEr合金的峰时效。AlZnMgCu合金的屈服强度提高38.5 MPa，伸长率提高4.5%。同时，由于Er和Si的协同作用，增强了AlZnMgCuSiEr合金的耐蚀性。最大晶间腐蚀深度由264.2 μm减小到9.9 μm。其根本原因是Si和Er的共添加调节了晶粒内和晶界析出相的演化。

引用次数: 0

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