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Process, influence factors and mechanism of direct generation of zinc metal using laser to irradiate ZnS
IF 4.7 1区 材料科学
Transactions of Nonferrous Metals Society of China Pub Date : 2025-02-01 DOI: 10.1016/S1003-6326(24)66703-8
Ying CHEN , Ning DUAN , Lin-hua JIANG , Hao JIN , Yao WANG , Yong LIU
{"title":"Process, influence factors and mechanism of direct generation of zinc metal using laser to irradiate ZnS","authors":"Ying CHEN ,&nbsp;Ning DUAN ,&nbsp;Lin-hua JIANG ,&nbsp;Hao JIN ,&nbsp;Yao WANG ,&nbsp;Yong LIU","doi":"10.1016/S1003-6326(24)66703-8","DOIUrl":"10.1016/S1003-6326(24)66703-8","url":null,"abstract":"<div><div>The generation process, influence of the laser parameters on the production of zinc metal (Zn<sup>0</sup>), and the mechanism of interaction between the laser and ZnS were studied. It was observed that an increase in the number of S defects enhanced the quantity of Zn<sup>2+</sup> ejected from the ZnS crystals, which increased the possibility of Zn<sup>2+</sup> bonding with electrons to produce Zn<sup>0</sup>. A maximum Zn<sup>0</sup> content of 9.3% in the products was detected upon changing the laser parameters. Upon analyzing the changes in the surface topography during the laser interaction with ZnS, it was shown that the interaction mechanism between laser and ZnS had a synergistic effect comprised of photochemical and photothermal processes, in which the photochemical mechanism predominated.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"35 2","pages":"Pages 613-624"},"PeriodicalIF":4.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Facile regeneration of spent lithium-ion battery cathode materials via tunable oxidization and reduction strategy
IF 4.7 1区 材料科学
Transactions of Nonferrous Metals Society of China Pub Date : 2025-02-01 DOI: 10.1016/S1003-6326(24)66706-3
Xue-hu ZHONG , Wen-qing QIN , Jiang ZHOU , Jun-wei HAN
{"title":"Facile regeneration of spent lithium-ion battery cathode materials via tunable oxidization and reduction strategy","authors":"Xue-hu ZHONG ,&nbsp;Wen-qing QIN ,&nbsp;Jiang ZHOU ,&nbsp;Jun-wei HAN","doi":"10.1016/S1003-6326(24)66706-3","DOIUrl":"10.1016/S1003-6326(24)66706-3","url":null,"abstract":"<div><div>A tunable oxidization and reduction strategy was proposed to directly regenerate spent LiFePO<sub>4</sub>/C cathode materials by oxidizing excessive carbon powders with the addition of FePO<sub>4</sub>. Experimental results indicate that spent LiFePO<sub>4</sub>/C cathode materials with good performance can be regenerated by roasting at 650 °C for 11 h with the addition of Li<sub>2</sub>CO<sub>3</sub>, FePO<sub>4</sub>, V<sub>2</sub>O<sub>5</sub>, and glucose. V<sub>2</sub>O<sub>5</sub> is added to improve the cycle performance of regenerated cathode materials. Glucose is used to revitalize the carbon layers on the surface of spent LiFePO<sub>4</sub>/C particles for improving their conductivity. The regenerated V-doped LiFePO<sub>4</sub>/C shows an excellent electrochemical performance with the discharge specific capacity of 161.36 mA·h/g at 0.2<em>C</em>, under which the capacity retention is 97.85% after 100 cycles.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"35 2","pages":"Pages 653-668"},"PeriodicalIF":4.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Inhibition mechanism of NaF on WE43 Mg alloy in NaCl solution
IF 4.7 1区 材料科学
Transactions of Nonferrous Metals Society of China Pub Date : 2025-02-01 DOI: 10.1016/S1003-6326(24)66692-6
Yun-tian YANG , Yu-xin ZHOU , Xiao-peng LU , Ji-rui MA , Jun-jie YANG , Fu-hui WANG
{"title":"Inhibition mechanism of NaF on WE43 Mg alloy in NaCl solution","authors":"Yun-tian YANG ,&nbsp;Yu-xin ZHOU ,&nbsp;Xiao-peng LU ,&nbsp;Ji-rui MA ,&nbsp;Jun-jie YANG ,&nbsp;Fu-hui WANG","doi":"10.1016/S1003-6326(24)66692-6","DOIUrl":"10.1016/S1003-6326(24)66692-6","url":null,"abstract":"<div><div>The influence of NaF on the microstructure, composition and corrosion performance of WE43 Mg alloy in 3.5 wt.% NaCl solution was systematically investigated by means of SEM, TEM, EPMA, XRD, XPS and electrochemical measurements. It was proved that NaF is an effective inhibitor for WE43 Mg alloy and the highest inhibition efficiency is 92.6% at its concentration of 40 mmol/L in neutral NaCl solution. The dissolution of WE43 alloy is inhibited by formation and deposition of a dense and protective double-layered corrosion film by chemical reaction between corrosion inhibitor and dissolved Mg<sup>2+</sup>. The microstructure and composition of this double-layered corrosion film were investigated by FIB and TEM. The outer layer of the corrosion film is found to be composed of NaMgF<sub>3</sub>, MgF<sub>2</sub> and MgO, while the inner layer mainly consists of MgO and MgF<sub>2</sub>.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"35 2","pages":"Pages 460-473"},"PeriodicalIF":4.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of rhenium addition on microstructure and mechanical properties of Ti−48Al−2Cr−2Nb alloys
IF 4.7 1区 材料科学
Transactions of Nonferrous Metals Society of China Pub Date : 2025-02-01 DOI: 10.1016/S1003-6326(24)66693-8
Sheng-hang XU , Jun-jie LAN , Meng HAN , Hui-bin ZHANG , Kai-jie SHEN , Jun-pin LIN , Hua-zhen CAO , Guo-qu ZHENG
{"title":"Effect of rhenium addition on microstructure and mechanical properties of Ti−48Al−2Cr−2Nb alloys","authors":"Sheng-hang XU ,&nbsp;Jun-jie LAN ,&nbsp;Meng HAN ,&nbsp;Hui-bin ZHANG ,&nbsp;Kai-jie SHEN ,&nbsp;Jun-pin LIN ,&nbsp;Hua-zhen CAO ,&nbsp;Guo-qu ZHENG","doi":"10.1016/S1003-6326(24)66693-8","DOIUrl":"10.1016/S1003-6326(24)66693-8","url":null,"abstract":"<div><div>The refractory metal rhenium (Re), with content of 0−2 at.%, was introduced into a typical <em>γ</em>-TiAl alloy of Ti−48Al−2Cr−2Nb (at.%) through vacuum arc melting. The effect of Re content on the microstructure and mechanical properties of the <em>γ</em>-TiAl alloy was investigated. The results show that the <em>γ</em>-TiAl−<em>x</em>Re alloy is composed of <em>γ, α</em><sub>2</sub>, and <em>β</em> phases. As the Re content increases, the proportion of <em>β</em> phase increases, while the content and size of <em>α</em><sub>2</sub>+<em>γ</em> lamellar structure decrease gradually. Furthermore, the compressive strength increases with increasing Re content. A maximum compressive strength of 2282 MPa is achieved for the <em>γ</em>-TiAl−2Re alloy. The <em>γ</em>-TiAl−2Re alloy exhibits a fracture strain of 36.7%, considerably higher than that of the <em>γ</em>-TiAl alloy (31.0%). Moreover, compared with the <em>γ</em>-TiAl alloy, the hardness and compressive strength of the <em>γ</em>-TiAl−2Re alloy considerably increase by 17.5% and 34.2%, respectively.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"35 2","pages":"Pages 474-485"},"PeriodicalIF":4.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Low-temperature pressureless consolidation of AlSi10Mg powders by low-intensity ultrasound
IF 4.7 1区 材料科学
Transactions of Nonferrous Metals Society of China Pub Date : 2025-02-01 DOI: 10.1016/S1003-6326(24)66684-7
Yu-ze LI , Long-fei ZHU , Xin WANG , Song TANG , Ting LUO , Jian-yuan WANG
{"title":"Low-temperature pressureless consolidation of AlSi10Mg powders by low-intensity ultrasound","authors":"Yu-ze LI ,&nbsp;Long-fei ZHU ,&nbsp;Xin WANG ,&nbsp;Song TANG ,&nbsp;Ting LUO ,&nbsp;Jian-yuan WANG","doi":"10.1016/S1003-6326(24)66684-7","DOIUrl":"10.1016/S1003-6326(24)66684-7","url":null,"abstract":"<div><div>Low-intensity ultrasound was applied to the pressureless consolidation of AlSi10Mg powders in a broad temperature range from 600 to 860 °C. Under static conditions, the consolidation of AlSi10Mg powders can only be achieved at 860 °C, but still with the presence of some residual unconsolidated regions. The introduction of low-intensity ultrasound at this temperature eliminates the unconsolidated regions and transforms the columnar grains observed in original directional solidification into equiaxed or globular grains. Remarkably, the application of low-intensity ultrasound significantly reduces the consolidation temperature to 620 °C, without compromising the microhardness of the resulting samples when compared to static conditions. Furthermore, by lowering the temperature to 600 °C, a well-sintered porous material is obtained through the assistance of the low-intensity ultrasound.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"35 2","pages":"Pages 349-361"},"PeriodicalIF":4.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of high-temperature and short-time solution treatment on microstructure and properties of Al−Mg−Zn−Ag alloy
IF 4.7 1区 材料科学
Transactions of Nonferrous Metals Society of China Pub Date : 2025-02-01 DOI: 10.1016/S1003-6326(24)66685-9
Cheng GUO , Yi-fei CHEN , Yu-qin GUO , Huan WANG , Hai-tao ZHANG , Jing-qi CHEN , Zi-bin WU , Xin-gang LIU , Hiromi NAGAUMI
{"title":"Influence of high-temperature and short-time solution treatment on microstructure and properties of Al−Mg−Zn−Ag alloy","authors":"Cheng GUO ,&nbsp;Yi-fei CHEN ,&nbsp;Yu-qin GUO ,&nbsp;Huan WANG ,&nbsp;Hai-tao ZHANG ,&nbsp;Jing-qi CHEN ,&nbsp;Zi-bin WU ,&nbsp;Xin-gang LIU ,&nbsp;Hiromi NAGAUMI","doi":"10.1016/S1003-6326(24)66685-9","DOIUrl":"10.1016/S1003-6326(24)66685-9","url":null,"abstract":"<div><div>High-temperature and short-time (HTST) solution heat treatment combined with non-isothermal aging (NIA) was employed to regulate the microstructure and properties of Al−4.5Mg−2.0Zn−0.3Ag alloy. Results indicate that HTST solution heat treatment can not only retain partial deformation dislocations, but inhibit the recrystallization behavior and increase the proportion of low-angle grain boundaries (LAGBs). In the subsequent NIA process, HTST solution heat treatment combined with NIA is instrumental in restraining the degradation of dislocations and promoting precipitation of nano-scale <em>T’</em>-Mg<sub>32</sub>(Al,Zn,Ag)<sub>49</sub> phase, which improves the strength of the alloy greatly. In addition, a higher fraction of LAGBs and the discontinuous distribution of grain boundary precipitates caused by this novel technology meliorate the corrosion resistance of Al−4.5Mg−2.0Zn−0.3Ag alloy.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"35 2","pages":"Pages 362-376"},"PeriodicalIF":4.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synergistic effect of low Gd+Mn additions on evolution of microstructure and mechanical properties of Mg−Gd−Mn alloy
IF 4.7 1区 材料科学
Transactions of Nonferrous Metals Society of China Pub Date : 2025-02-01 DOI: 10.1016/S1003-6326(24)66690-2
Dong-dong GU , Jian PENG , Fu-sheng PAN
{"title":"Synergistic effect of low Gd+Mn additions on evolution of microstructure and mechanical properties of Mg−Gd−Mn alloy","authors":"Dong-dong GU ,&nbsp;Jian PENG ,&nbsp;Fu-sheng PAN","doi":"10.1016/S1003-6326(24)66690-2","DOIUrl":"10.1016/S1003-6326(24)66690-2","url":null,"abstract":"<div><div>The synergistic effect of low Gd+Mn additions on the evolution of microstructure and mechanical properties of Mg−<em>x</em>Gd−0.8Mn alloy was investigated. Gd addition shows a strong grain refinement effect on the extruded Mg−<em>x</em>Gd−0.8Mn alloy, and leads to a continuous decrease in the area fraction of basal texture grains and the corresponding maximum density of texture components. However, the maximum density of the basal texture components grows abruptly as Gd content increases to 6 wt.%. When the Gd content is below 6 wt.%, the asymmetry of the tensile and compressive yield of the alloy is negatively correlated to the Gd content due to grain refinement and texture weakening effects. Besides, the contribution of grain refinement to higher alloy yield strength is more significant than that of grain orientation. Compared with the extruded Mg−<em>x</em>Gd alloy, the extruded Mg−<em>x</em>Gd−0.8Mn alloy shows a lower limit composition point that corresponds to solid solution strengthening and plasticizing effect (2 wt.% and 4 wt.%). Finally, the trend of basal slip and prismatic slip resistance variations of the extruded Mg−<em>x</em>Gd−0.8Mn alloys was predicted.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"35 2","pages":"Pages 431-445"},"PeriodicalIF":4.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Laser welding of molybdenum socket joint for ultra-high-temperature heat pipes based on niobium alloying
IF 4.7 1区 材料科学
Transactions of Nonferrous Metals Society of China Pub Date : 2025-02-01 DOI: 10.1016/S1003-6326(24)66696-3
Jia-xuan ZHAO , Hong-da ZHANG , Lin-jie ZHANG , Xiang-dong DING , Yuan-jun SUN , Guang SUN
{"title":"Laser welding of molybdenum socket joint for ultra-high-temperature heat pipes based on niobium alloying","authors":"Jia-xuan ZHAO ,&nbsp;Hong-da ZHANG ,&nbsp;Lin-jie ZHANG ,&nbsp;Xiang-dong DING ,&nbsp;Yuan-jun SUN ,&nbsp;Guang SUN","doi":"10.1016/S1003-6326(24)66696-3","DOIUrl":"10.1016/S1003-6326(24)66696-3","url":null,"abstract":"<div><div>The influence of Ti and Zr, Nb alloying on the microstructures and performance of laser-welded molybdenum socket joints was investigated. Following Nb alloying, the average microhardness of the fusion zone (FZ) increased from HV 194.7 to HV 283.3. Additionally, Nb can react with O to form dispersed Nb<sub>2</sub>O<sub>5</sub> along grain boundaries, impeding grain boundary migration and dislocation movement while reducing the content of volatile Mo oxide along these boundaries. The incorporation of Nb in FZ partially inhibits pore defects and enhances joint load- bearing capacity. In comparison to the laser-welded joints without adding Nb (LW), the tensile strength of the laser- welded joints with Nb alloying (LW-Nb) was significantly improved by approximately 69% from 327.5 to 551.7 MPa. Furthermore, the fracture mechanism of the joints transitioned from intergranular fracture to transgranular fracture.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"35 2","pages":"Pages 511-524"},"PeriodicalIF":4.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hot deformation characteristics and dynamic recrystallization of Ti−6Al−4V−0.5Mo−0.5Zr alloy used for petroleum drill pipe
IF 4.7 1区 材料科学
Transactions of Nonferrous Metals Society of China Pub Date : 2025-02-01 DOI: 10.1016/S1003-6326(24)66694-X
Zhen-ni ZHOU , Gao-yong LIN , Yu-hao AI , Wei-zhong FENG , Ping-hui ZHANG , Hui-qun LIU
{"title":"Hot deformation characteristics and dynamic recrystallization of Ti−6Al−4V−0.5Mo−0.5Zr alloy used for petroleum drill pipe","authors":"Zhen-ni ZHOU ,&nbsp;Gao-yong LIN ,&nbsp;Yu-hao AI ,&nbsp;Wei-zhong FENG ,&nbsp;Ping-hui ZHANG ,&nbsp;Hui-qun LIU","doi":"10.1016/S1003-6326(24)66694-X","DOIUrl":"10.1016/S1003-6326(24)66694-X","url":null,"abstract":"<div><div>The high-temperature compression deformation behavior of Ti−6Al−4V−0.5Mo−0.5Zr alloy was investigated at temperatures from 890 to 1030 °C and strain rates from 0.01 to 10 s<sup>−1</sup>, and the corresponding dynamic recrystallization (DRX) mechanism was revealed. The results indicate that under different deformation conditions, the intensity of flow stress oscillations varied significantly. During thermal deformation in the <em>α</em> + <em>β</em> phase region, the stress−strain curves exhibited DRX. At temperatures below 950 °C, continuous dynamic recrystallization (CDRX) of the <em>α</em> grains and fracturing of the strip-like phase were apparent. At temperature higher than 950 °C, the <em>β</em> phase and a part of secondary <em>α</em> colonies underwent DRX.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"35 2","pages":"Pages 486-498"},"PeriodicalIF":4.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-temperature fatigue cracking mechanism and microstructure evolution of aero-engine K4169 superalloy in service process
IF 4.7 1区 材料科学
Transactions of Nonferrous Metals Society of China Pub Date : 2025-02-01 DOI: 10.1016/S1003-6326(24)66695-1
Song-jun WANG , Jian-jun HE , Zhi-hui GONG , Wei-ping LI , Jun-gang YANG , Ya-jun SHAO , Yu-hui CAI , Yue-xin DU , Cheng-wei YANG
{"title":"High-temperature fatigue cracking mechanism and microstructure evolution of aero-engine K4169 superalloy in service process","authors":"Song-jun WANG ,&nbsp;Jian-jun HE ,&nbsp;Zhi-hui GONG ,&nbsp;Wei-ping LI ,&nbsp;Jun-gang YANG ,&nbsp;Ya-jun SHAO ,&nbsp;Yu-hui CAI ,&nbsp;Yue-xin DU ,&nbsp;Cheng-wei YANG","doi":"10.1016/S1003-6326(24)66695-1","DOIUrl":"10.1016/S1003-6326(24)66695-1","url":null,"abstract":"<div><div>By using fatigue crack propagation testing and microstructural characterization, the crack fracture and propagation mechanisms of K4169 superalloy under various loads were investigated. The results demonstrate that the grain sizes of K4169 superalloy significantly increase, and the precipitation of the needle-like <em>δ</em> phase and the Laves phase is observed. Voids and microcracks form at location of Laves phase enrichment, creating conditions for crack propagation. By the <em>a</em>−<em>N</em> (<em>a</em> is the crack length, and <em>N</em> is the number of cycles) relationship curve, the change in the fatigue crack growth rate with the increasing number of cycles progresses through three separate stages. The fracture process of K4169 superalloy under low-stress cyclic loading (3 kN) exhibits the ductile fracture. Subsequently, the fracture process starts to change from the ductile fracture to the brittle fracture as the stress increases to 4.5 kN. In the microstructures of fractures in both stress states, intergranular propagation is the mechanism responsible for crack propagation. Moreover, the Laves phase exists near the fracture crack, which is in line with the post-service structural phenomenon.</div></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"35 2","pages":"Pages 499-510"},"PeriodicalIF":4.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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