Acta Metallurgica Sinica-English Letters最新文献_第10页

NbB2 Modified Al–Cu Alloys Fabricated by Freeze-Ablation Casting under High Cooling Rate Solidification 在高冷却速率凝固条件下通过冷冻喷射铸造制造 NbB2 改性铝铜合金

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2024-03-05 DOI: 10.1007/s40195-024-01675-3

Xiang Kong, Yu Wang, Hong Xu, Haotian Fan, Yuewu Zheng, Beibei Xie

{"title":"NbB2 Modified Al–Cu Alloys Fabricated by Freeze-Ablation Casting under High Cooling Rate Solidification","authors":"Xiang Kong, Yu Wang, Hong Xu, Haotian Fan, Yuewu Zheng, Beibei Xie","doi":"10.1007/s40195-024-01675-3","DOIUrl":"10.1007/s40195-024-01675-3","url":null,"abstract":"<div><p>At present, improving the properties of aluminum alloys is generally achieved by increasing the cooling rate of the melt and adding micro-nano particles. Controlling the cooling rate of the melt to improve the refining effect of grain refiner is still a difficult problem in the aluminum alloy casting industry. An innovative and environmentally friendly casting process, known as freeze ablation, was introduced during the preparation of an Al–NbB<sub>2</sub> intermediate alloy. This process significantly enhanced the cooling rate of the melt. The results indicated that the Al–NbB<sub>2</sub> intermediate alloy produced under high cooling rates had a noticeable refining effect on Al–Cu alloys, with smaller NbB<sub>2</sub> particles demonstrating superior refining performance. The average grain size of the refined Al–Cu alloy decreased from 154 to 69 μm, the tensile strength increased by 12%, the fluidity increased by 18.4%, and the hot tearing index decreased from 144 to 12. The matching degree between NbB<sub>2</sub> and <i>α</i>-Al was calculated using high-resolution transmission electron microscopy and the edge-to-edge model. It was found that the atomic interplanar spacing and the interatomic spacing mismatch between NbB<sub>2</sub>’s <11<span>({overline{text{2}}})</span>0<b>> </b>plane and Al were both less than 10%, which further proved that NbB<sub>2</sub> could serve as an effective nucleation site for <i>α</i>-Al grains to achieve grain refinement.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure Evolution and Mechanical Properties of Friction Stir Welded Al–Cu–Li Alloy 摩擦搅拌焊接铝-铜-锂合金的显微结构演变和力学性能

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2024-03-05 DOI: 10.1007/s40195-024-01674-4

Peng Chen, Wenhao Chen, Jiaxin Chen, Zhiyu Chen, Yang Tang, Ge Liu, Bensheng Huang, Zhiqing Zhang

{"title":"Microstructure Evolution and Mechanical Properties of Friction Stir Welded Al–Cu–Li Alloy","authors":"Peng Chen, Wenhao Chen, Jiaxin Chen, Zhiyu Chen, Yang Tang, Ge Liu, Bensheng Huang, Zhiqing Zhang","doi":"10.1007/s40195-024-01674-4","DOIUrl":"10.1007/s40195-024-01674-4","url":null,"abstract":"<div><p>The investigation concentrates on friction stir welded (FSW) Al–Cu–Li alloy concerning its local microstructural evolution and mechanical properties. The grain features were characterized by electron back scattered diffraction (EBSD) technology, while precipitate characterization was conducted by using transmission electron microscopy (TEM) aligned along [011]<sub>Al</sub> and [001]<sub>Al</sub> zone axes. The mechanical properties are evaluated through micro-hardness and tensile testing. It can be found that nugget zones exhibit finely equiaxed grains evolved through complete dynamic recrystallization (DRX), primarily occurring in continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX). In the thermal–mechanically affected zone (TMAZ), numerous sub-structured grains, exhibiting an elongated morphology, were created due to partial DRX, signifying the dominance of CDRX, DDRX, and geometric dynamic recrystallization (GDRX) in this region. T<sub>1</sub> completely dissolves in the nugget zone (NZ) leading to the formation of Guinier–Preston zones and increase of δ′, β′ and S′. Conversely, T<sub>1</sub> partially solubilizes in TMAZ, the lowest hardness zone (LHZ) and heat affected zone (HAZ), and the residual T<sub>1</sub> undergoes marked coarsening, revealing various T<sub>1</sub> variants. The solubilization and coarsening of T<sub>1</sub> are primary contributors to the degradation of hardness and strength. θ′ primarily dissolves and coarsens in NZ and TMAZ, whilst this precipitate largely coarsens in HAZ and LHZ. σ, T<sub>B</sub>, grain boundary phases (GBPs) and precipitate-free zone (PFZ) are newly generated during FSW. σ exists in the TMAZ, LHZ and HAZ, whereas T<sub>B</sub> nucleates in NZ. GBPs and PFZ mostly develop in LHZ and HAZ, which can cause strain localization during tensile deformation, potentially leading to LHZ joint fracture.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Notably Accelerated Nano-Bainite Transformation via Increasing Undissolved Carbides Content on GCr15Si1Mo Bearing Steel 通过增加未溶解碳化物含量显著加速 GCr15Si1Mo 轴承钢的纳米贝氏体转变

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2024-02-29 DOI: 10.1007/s40195-023-01652-2

Yan-Hui Wang, Hua-Qiang Sun, Wen-Jing Feng, Lei-Jie Zhao, Xiang Chen, Qing-An Chen, Hai-Tao Sun, Jian-Jun Wang, Zhi-Nan Yang

{"title":"Notably Accelerated Nano-Bainite Transformation via Increasing Undissolved Carbides Content on GCr15Si1Mo Bearing Steel","authors":"Yan-Hui Wang, Hua-Qiang Sun, Wen-Jing Feng, Lei-Jie Zhao, Xiang Chen, Qing-An Chen, Hai-Tao Sun, Jian-Jun Wang, Zhi-Nan Yang","doi":"10.1007/s40195-023-01652-2","DOIUrl":"10.1007/s40195-023-01652-2","url":null,"abstract":"<div><p>In this study, a high-carbon nano-bainitic GCr15Si1Mo bearing steel was investigated. Specifically, the effects of content and size of undissolved carbides on the microstructure and transformation kinetics of nano-bainite were analyzed. The results demonstrated that after prolonged austempering at low temperatures, the mixed microstructure composed of nano-bainite (NB), undissolved carbides (UC), and retained austenite (RA) was obtained in GCr15SiMo steel. When the experimental steel was austenitized at 900 °C, the undissolved carbides gradually dissolved until reaching a stable state with increasing holding time. Furthermore, at the same austempering temperature, despite different volume fractions of undissolved carbides in the substrate, the volume fractions of nano-bainite in the final microstructures remained essentially the same. Moreover, the higher the content of undissolved carbides in steel, the faster the transformation rate of nano-bainite and the shorter the total transformation time.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140002125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Y and Ce Micro-alloying on Microstructure and Hot Tearing of As-Cast Al–Cu–Mg Alloy Y 和 Ce 微合金化对砷铸铝-铜-镁合金显微组织和热撕裂的影响

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2024-02-29 DOI: 10.1007/s40195-024-01671-7

Chunyu Yue, Bowen Zheng, Ming Su, Yuxiang Wang, Xiaojiao Zuo, Yinxiao Wang, Xiaoguang Yuan

{"title":"Effect of Y and Ce Micro-alloying on Microstructure and Hot Tearing of As-Cast Al–Cu–Mg Alloy","authors":"Chunyu Yue, Bowen Zheng, Ming Su, Yuxiang Wang, Xiaojiao Zuo, Yinxiao Wang, Xiaoguang Yuan","doi":"10.1007/s40195-024-01671-7","DOIUrl":"10.1007/s40195-024-01671-7","url":null,"abstract":"<div><p>In this work, the Al–Cu–Mg alloy with different Y (0–0.2 wt%) and Ce (0.5–1.5 wt%) are designed. The effect of mixed addition of Y and Ce on the grain structure and hot tearing for Al–4.4Cu–1.5Mg–0.15Zr alloy was investigated using \"cross\" hot tearing mould. The results indicate that as rare earth Y and Ce increases, the grain size becomes finer, the grain morphology changes from dendrite to equiaxed grain, and effectively reduce the hot tearing sensitivity coefficient (HTS<sub>1</sub>) and crack susceptibility coefficient (CSC) of the alloy. With the increase of Ce element (0.5–1.5 wt%), the hot tearing susceptibility of the alloy decreases first and then increases. With the increase of Y element (0–0.2 wt%), the hot tearing sensitivity of the alloy decreases. When the content of rare earth is 0.2 wt% Y + 1.0 wt% Ce, the minimum HTS<sub>1</sub> value and CSC value of the alloy are 68 and 0.53, respectively. Rare earth Ce refines the alloy microstructure, shortens the feeding channel, and reduces the hot tearing initiation. Meanwhile, the rare earth Y can form Al<sub>6</sub>Cu<sub>6</sub>Y phase at the grain boundary, improve the feeding capacity of the alloy. Therefore, appropriate addition of rare earth Y and Ce can effectively reduce the hot tearing tendency of the alloy.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140002324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced Strength–Ductility Synergy in Submerged Friction Stir Processing ER2319 Alloy Manufactured by Wire-Arc Additive Manufacturing via Creating Ultrafine Microstructure 通过创建超细微结构提高浸没摩擦搅拌加工 ER2319 合金的强度-延展性协同效应

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2024-02-29 DOI: 10.1007/s40195-023-01655-z

Jinpeng Hu, Tao Sun, Fujun Cao, Yifu Shen, Zhiyuan Yang, Chan Guo

{"title":"Enhanced Strength–Ductility Synergy in Submerged Friction Stir Processing ER2319 Alloy Manufactured by Wire-Arc Additive Manufacturing via Creating Ultrafine Microstructure","authors":"Jinpeng Hu, Tao Sun, Fujun Cao, Yifu Shen, Zhiyuan Yang, Chan Guo","doi":"10.1007/s40195-023-01655-z","DOIUrl":"10.1007/s40195-023-01655-z","url":null,"abstract":"<div><p>Submerged friction stir processing (SFSP) with flowing water was employed to alleviate the porosities and coarse-grained structure introduced by wire-arc manufacturing. As a result, uniform and ultrafine grained (UFG) structure with average grain size of 0.83 μm was achieved with the help of sharply reduced heat input and holding time at elevated temperature. The optimized UFG structure enabled a superior combination of strength and ductility with high ultimate tensile strength and elongation of 273.17 MPa and 15.39%. Specifically, grain refinement strengthening and decentralized <i>θ</i>(Al<sub>2</sub>Cu) phase in the sample subjected to SFSP made great contributions to the enhanced strength. In addition, the decrease in residual stresses and removal of pores substantially enhance the ductility. High rates of cooling and low temperature cycling, which are facilitated by the water-cooling environment throughout the machining process, are vital in obtaining superior microstructures. This work provides a new method for developing a uniform and UFG structure with excellent mechanical properties.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140002122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving Fatigue Properties of 316L Stainless Steel Welded Joints by Surface Spinning Strengthening 通过表面旋压强化提高 316L 不锈钢焊接接头的疲劳性能

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2024-02-29 DOI: 10.1007/s40195-024-01668-2

Dongqiqiong Wang, Qiang Wang, Xiaowu Li, Zhefeng Zhang

{"title":"Improving Fatigue Properties of 316L Stainless Steel Welded Joints by Surface Spinning Strengthening","authors":"Dongqiqiong Wang, Qiang Wang, Xiaowu Li, Zhefeng Zhang","doi":"10.1007/s40195-024-01668-2","DOIUrl":"10.1007/s40195-024-01668-2","url":null,"abstract":"<div><p>The surface spinning strengthening (3S) mechanism and fatigue life extension mechanism of 316L stainless steel welded joint were systematically elucidated by microstructural analyses and mechanical tests. Results indicate that surface gradient hardening layer of approximately 1 mm is formed in the base material through grain fragmentation and deformation twin strengthening, as well as in the welding zone composed of deformed <i>δ</i>-phases and nanotwins. The fatigue strength of welded joint after 3S significantly rises by 32% (from 190 to 250 MPa), which is attributed to the effective elimination of surface geometric defects, discrete refinement of <i>δ</i>-Fe phases and the appropriate improvement in the surface strength, collectively mitigating strain localization and surface fatigue damage within the gradient strengthening layer. The redistributed fine <i>δ</i>-Fe phases benefited by strong stress transfer of 3S reduce the risk of surface weak phase cracking, causing the fatigue fracture to transition from microstructure defects to crystal defects dominated by slip, further suppressing the initiation and early propagation of fatigue cracks.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140001795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Migration Behavior of Impurity Iron in Silicon Melt Under Pulsed Electric Current 脉冲电流下硅熔体中杂质铁的迁移行为

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2024-02-29 DOI: 10.1007/s40195-024-01667-3

Mengcheng Zhou, Yaxiong Dai, Changhao Liu, Shengli Ding, Xinfang Zhang

{"title":"Migration Behavior of Impurity Iron in Silicon Melt Under Pulsed Electric Current","authors":"Mengcheng Zhou, Yaxiong Dai, Changhao Liu, Shengli Ding, Xinfang Zhang","doi":"10.1007/s40195-024-01667-3","DOIUrl":"10.1007/s40195-024-01667-3","url":null,"abstract":"<div><p>The impurity iron in silicon material will seriously affect the photoelectric conversion efficiency of silicon solar cells. However, the traditional silicon purification method has the disadvantages of long cycle, high energy consumption and serious pollution. In this study, an efficient and green pulsed electric current purification technology is proposed. The electromigration effect of iron elements, the current density gradient driving of iron phase, and the gravity of iron phase all affect the migration behavior of iron phase in silicon melt under pulsed electric current. Regardless of the depth of electrode insertion into the silicon melt, the solubility of iron in silicon decreases under the pulsed electric current, which helps to form the iron phase. At the same time, the iron phase tends to sink toward the bottom under the influence of gravity. When the electrode is shallowly inserted, a non-uniform electric field is formed in the silicon melt, and the iron phase is mainly driven by the current density gradient to accelerate sink toward the bottom. When the electrode is fully inserted, an approximately uniform electric field is formed in the silicon melt, and iron elements are preferentially migrated to the cathode by electromigration, forming iron phase sinking at the cathode. The study of impurity iron migration behavior in silicon melt under pulsed electric current provides a new approach for the purification of polycrystalline silicon.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140002123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Uncovering Microstructure–Property Relationship in Ni-Alloyed Fe–Mn–Al–C Low-Density Steel Treated by Hot-Rolling and Air-Cooling Process 揭示热轧和空冷工艺处理的 Ni-Al 合金 Fe-Mn-Al-C 低密度钢的显微结构与性能关系

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2024-02-17 DOI: 10.1007/s40195-024-01666-4

Xiaoliang Jia, Guhui Gao, Xiaolu Gui, Chun Feng, R. D. K. Misra, Bingzhe Bai

{"title":"Uncovering Microstructure–Property Relationship in Ni-Alloyed Fe–Mn–Al–C Low-Density Steel Treated by Hot-Rolling and Air-Cooling Process","authors":"Xiaoliang Jia, Guhui Gao, Xiaolu Gui, Chun Feng, R. D. K. Misra, Bingzhe Bai","doi":"10.1007/s40195-024-01666-4","DOIUrl":"10.1007/s40195-024-01666-4","url":null,"abstract":"<div><p>This paper focuses on the relationship between the microstructure and tensile properties of Fe–Mn–Al–C low-density high-strength steel processes by hot-rolling and air-cooling process. The microstructure analysis reveals that the combination of hot-rolling and air-cooling results in the formation of heterogeneous structures comprising different-sized <i>γ</i> and B2 phases in the low-density steel with the addition of nickel (Ni). The addition of Ni promotes the formation of the B2 phase and induces the pinning of B2 phase particles at the <i>γ</i> grain boundaries. This pinning effect effectively hinders the growth of the <i>γ</i> grains, leading to grain refinement. The tensile test results demonstrate that LDS-5Ni (low-density steel, LDS) exhibits excellent high strength and ductility combination, e.g., a tensile strength of 1535 MPa, yield strength of 1482 MPa, and elongation of 23.3%. These remarkable mechanical properties are primarily attributed to the combined strengthening contributions of grain refinement and duplex nano-sized second-phase precipitation hardening.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139902546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tailoring the Microstructure and Mechanical Property of Mg-Zn Matrix Composite via the Addition of Al Element 通过添加铝元素定制镁锌基复合材料的微观结构和力学性能

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2024-02-17 DOI: 10.1007/s40195-024-01669-1

Chong Wang, Fuyuan Liu, Xuejian Wang, Enyu Guo, Zelong Du, Kunkun Deng, Zongning Chen, Huijun Kang, Guohao Du, Tongmin Wang

{"title":"Tailoring the Microstructure and Mechanical Property of Mg-Zn Matrix Composite via the Addition of Al Element","authors":"Chong Wang, Fuyuan Liu, Xuejian Wang, Enyu Guo, Zelong Du, Kunkun Deng, Zongning Chen, Huijun Kang, Guohao Du, Tongmin Wang","doi":"10.1007/s40195-024-01669-1","DOIUrl":"10.1007/s40195-024-01669-1","url":null,"abstract":"<div><p>The semi-solid stir casting method is adopted to prepare 10 wt% SiC<sub>p</sub>/Mg–6Zn–0.5Ca–<i>x</i>Al (<i>x</i> = 0, 1, 3 and 5 wt%) composites, and the microstructure evolution and mechanical property of composites with various Al content are investigated. The results show that the addition of 3 wt% Al improves the distribution of SiC<sub>p</sub>, whereas the SiC<sub>p</sub> cluster occurs again with Al content greater than 3%. An abnormal phenomenon of twinning is observed in the cast composites in this work. The SiC<sub>p</sub>/Mg–6Zn–0.5Ca composite possesses the highest twin content of ~ 23%, for which tension twins (TTW) and compression twins (CTW) account for ~ 19% and ~ 3%, respectively. The CTW is only observed in ZXA600 composite. The addition of Al has an inhibiting effect for the generation and growth of twins. The content of twin decreases firstly and then increases with increase of Al content. The lowest twin content is obtained as Al increases to 3 wt%. It is found the existence of twin is detrimental to the mechanical property of composites. As-cast SiC<sub>p</sub>/Mg–6Zn–0.5Ca–3Al composite with the lowest twin content exhibits the optimal mechanical property of yield strength, ultimate tensile strength and elongation for 100 MPa, 188 MPa and 4.4%, respectively. The outstanding mechanical property is attributed to the uniform distribution of SiC<sub>p</sub>, the low twin content and the well-distributed fine second phases.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139902554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-Temperature Stability of Mg–1Al–12Y Alloy Containing LPSO Phase and Mechanism of Its Portevin–Le Chatelier (PLC) Effect 含 LPSO 相的 Mg-1Al-12Y 合金的高温稳定性及其波特文-勒夏特列（PLC）效应机制

IF 2.9 2区材料科学

Acta Metallurgica Sinica-English Letters Pub Date : 2024-02-17 DOI: 10.1007/s40195-024-01663-7

Qian-Long Ren, Shuai Yuan, Shi-Yu Luan, Jin-Hui Wang, Xiao-Wei Li, Xiao-Yu Liu

{"title":"High-Temperature Stability of Mg–1Al–12Y Alloy Containing LPSO Phase and Mechanism of Its Portevin–Le Chatelier (PLC) Effect","authors":"Qian-Long Ren, Shuai Yuan, Shi-Yu Luan, Jin-Hui Wang, Xiao-Wei Li, Xiao-Yu Liu","doi":"10.1007/s40195-024-01663-7","DOIUrl":"10.1007/s40195-024-01663-7","url":null,"abstract":"<div><p>In this study, the high-temperature stability and the generation mechanism of the Portevin–Le Chatelier (PLC) effect in solid-solution Mg–1Al–12Y alloy with different heat treatment processes were investigated by adjusting the content of long-period stacking ordered (LPSO) phases. It was found that the content of LPSO phases in the alloys differed the most after heat treatment at 530 °C for 16 h and 24 h, with values of 13.56% and 3.93% respectively. Subsequently, high-temperature tensile experiments were conducted on these two alloys at temperatures of 150 °C, 200 °C, 250 °C, and 300 °C. The results showed that both alloys exhibited the PLC effect at temperatures ranging from 150 to 250 °C. However, at a temperature 300 °C, only the alloy with a greater concentration of LPSO phases exhibited the PLC effect, whereas the alloy with a lower proportion of LPSO phases did not exhibit this phenomenon. Additionally, both alloys exhibited remarkable high-temperature stability, with the alloy containing a greater percentage of LPSO phases also demonstrating superior strength. The underlying mechanism for this phenomenon lies in the exceptional high-temperature stability exhibited by the second phase within the alloy. Furthermore, the LPSO phase effectively obstructs the movement of dislocations, and it also undergoing kinking to facilitate plastic deformation of the alloy. The results indicate that the PLC effect can be suppressed by reducing dislocation pile-up at grain boundaries, which leads to a decrease in alloy plasticity but an increase in strength. The presence of the PLC effect in the WA121 alloy is attributed to the abundant dispersed second phase within the alloy, which initially hinders the movement of dislocations, leading to an increase in stress, and subsequently releases the dislocations, allowing them to continue their movement and thereby reducing in stress.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139903989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0