Acta Metall Sin  1996, Vol. 32 Issue (5): 456-461    DOI:

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DISLOCATION FEATURES IN POLYSYNTHETICALLY TWINNED TiAl CRYSTALS AFTER DEFORMATION AT HIGH TEMPERATURE

LIU Yi;LIN Dongliang; WANG Dening; CHEN Da; CHEN Shipu(Shanghai Jiaotong University; Shanghai 200030; State Key Laboratory of Solid State Microstructures; Nanjing University; Nanjing 210008); LIU Zhiguo; MENG Xiangkang (Nanjing University; Nanjing 210008)(Manuscript received 1995-09-07)

LIU Yi;LIN Dongliang; WANG Dening; CHEN Da; CHEN Shipu(Shanghai Jiaotong University; Shanghai 200030; State Key Laboratory of Solid State Microstructures; Nanjing University; Nanjing 210008); LIU Zhiguo; MENG Xiangkang (Nanjing University; Nanjing 210008)(Manuscript received 1995-09-07). DISLOCATION FEATURES IN POLYSYNTHETICALLY TWINNED TiAl CRYSTALS AFTER DEFORMATION AT HIGH TEMPERATURE. Acta Metall Sin, 1996, 32(5): 456-461.

Abstract References Related Articles Recommended Metrics Download:  PDF(549KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The dislocation features in polysynthetically twinned (PST) TiAl crystal deformed at 400, 600 and 850℃ have been investgated by TEM. Screw <011] superdislocations turned to dissociate on {100} planes to form Kear-Wilsdorf locks. Faulted dipoles were found in specimens deformed below 600℃ , whereas no faulted dipole was found at 850℃.In-situ heating observations on the faulted dipoles formed during deformation at room temperature indicated that the faulted dipole disappeared at about 600℃. Based on these experimental results, the mechanism of brittle-to-ductile of TiAl alloy has been discussed. Key words:  polysynthetically twinned crystal      TiAl      intermetallics      dislocation      high temperature deformation      Received:  18 May 1996      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1996/V32/I5/456 1LipsittHA,SchechtmanD,SchafrikRE．MetallTrans,1975;6A:19912YamaguchiM,InuiH．MaterResSocSympProc,1995;364:13刘毅,汪德宁,陈达,林栋梁,刘治国．金属学报,1995,31:3934刘毅,汪德宁,陈达,林栋梁,刘治国,孟祥康．金属学报,1995;32:4495InuiH,OhMH,NakamuraA,YamaguchiM．PhitosMag,1992;66A:5396KearBH,WilsdorfHGE．TransMetallSocAIME,1962;224:3827SchechtmanD,BlackburnMJ,LipsittHA．MetallTrans,1974;54:13738HugG,LoiseanA,Lasalmonie．PhilosMag,1986;54A:479YaoK-F,InuiH,KishidaK,YamaguchiM．ActaMetallMater,1995;43:1075 [1] LI Fulin, FU Rui, BAI Yunrui, MENG Lingchao, TAN Haibing, ZHONG Yan, TIAN Wei, DU Jinhui, TIAN Zhiling. Effects of Initial Grain Size and Strengthening Phase on Thermal Deformation and Recrystallization Behavior of GH4096 Superalloy[J]. 金属学报, 2023, 59(7): 855-870. [2] HAN Weizhong, LU Yan, ZHANG Yuheng. Mechanism of Ductile-to-Brittle Transition in Body-Centered-Cubic Metals：A Brief Review[J]. 金属学报, 2023, 59(3): 335-348. [3] WANG Hu, ZHAO Lin, PENG Yun, CAI Xiaotao, TIAN Zhiling. Microstructure and Mechanical Properties of TiB2 Reinforced TiAl-Based Alloy Coatings Prepared by Laser Melting Deposition[J]. 金属学报, 2023, 59(2): 226-236. [4] XIA Dahai, JI Yuanyuan, MAO Yingchang, DENG Chengman, ZHU Yu, HU Wenbin. Localized Corrosion Mechanism of 2024 Aluminum Alloy in a Simulated Dynamic Seawater/Air Interface[J]. 金属学报, 2023, 59(2): 297-308. [5] LI Xiaobing, QIAN Kun, SHU Lei, ZHANG Mengshu, ZHANG Jinhu, CHEN Bo, LIU Kui. Effect of W Content on the Phase Transformation Behavior in Ti-42Al-5Mn- xW Alloy[J]. 金属学报, 2023, 59(10): 1401-1410. [6] SHEN Yingying, ZHANG Guoxing, JIA Qing, WANG Yumin, CUI Yuyou, YANG Rui. Interfacial Reaction and Thermal Stability of the SiCf/TiAl Composites[J]. 金属学报, 2022, 58(9): 1150-1158. [7] HAN Dong, ZHANG Yanjie, LI Xiaowu. Effect of Short-Range Ordering on the Tension-Tension Fatigue Deformation Behavior and Damage Mechanisms of Cu-Mn Alloys with High Stacking Fault Energies[J]. 金属学报, 2022, 58(9): 1208-1220. [8] CHEN Yuyong, YE Yuan, SUN Jianfei. Present Status for Rolling TiAl Alloy Sheet[J]. 金属学报, 2022, 58(8): 965-978. [9] LIU Renci, WANG Peng, CAO Ruxin, NI Mingjie, LIU Dong, CUI Yuyou, YANG Rui. Influence of Thermal Exposure at 700oC on the Microstructure and Morphology in the Surface of β-Solidifying γ-TiAl Alloys[J]. 金属学报, 2022, 58(8): 1003-1012. [10] ZHENG Shijian, YAN Zhe, KONG Xiangfei, ZHANG Ruifeng. Interface Modifications on Strength and Plasticity of Nanolayered Metallic Composites[J]. 金属学报, 2022, 58(6): 709-725. [11] TIAN Ni, SHI Xu, LIU Wei, LIU Chuncheng, ZHAO Gang, ZUO Liang. Effect of Pre-Tension on the Fatigue Fracture of Under-Aged 7N01 Aluminum Alloy Plate[J]. 金属学报, 2022, 58(6): 760-770. [12] GAO Chuan, DENG Yunlai, WANG Fengquan, GUO Xiaobin. Effect of Creep Aging on Mechanical Properties of Under-Aged 7075 Aluminum Alloy[J]. 金属学报, 2022, 58(6): 746-759. [13] HU Chen, PAN Shuai, HUANG Mingxin. Strong and Tough Heterogeneous TWIP Steel Fabricated by Warm Rolling[J]. 金属学报, 2022, 58(11): 1519-1526. [14] WU Xiaolei, ZHU Yuntian. Heterostructured Metallic Materials: Plastic Deformation and Strain Hardening[J]. 金属学报, 2022, 58(11): 1349-1359. [15] AN Xudong, ZHU Te, WANG Qianqian, SONG Yamin, LIU Jinyang, ZHANG Peng, ZHANG Zhaokuan, WAN Mingpan, CAO Xingzhong. Interaction Mechanism of Dislocation and Hydrogen in Austenitic 316 Stainless Steel[J]. 金属学报, 2021, 57(7): 913-920. No Suggested Reading articles found! Viewed Full text Abstract Cited   Shared      Discussed