Acta Metall Sin  1998, Vol. 34 Issue (5): 538-544    DOI:

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PHASE COMPOSITION AND TRANSFORMATION STRESS OF PRIMARY LAMELLAR STRUCTURE IN γ-TiAl-BASED DUPLEX ALLOY DURING ISOTHERMAL DECOMPOSITION

WANG Jijie;ZONG Yaping;QIN Gaowu; HAO Shiming (School of Materials and Metallurgy; Northeastern University; Shenyang 110006)

WANG Jijie;ZONG Yaping;QIN Gaowu; HAO Shiming (School of Materials and Metallurgy; Northeastern University; Shenyang 110006). PHASE COMPOSITION AND TRANSFORMATION STRESS OF PRIMARY LAMELLAR STRUCTURE IN γ-TiAl-BASED DUPLEX ALLOY DURING ISOTHERMAL DECOMPOSITION. Acta Metall Sin, 1998, 34(5): 538-544.

Abstract References Related Articles Recommended Metrics Download:  PDF(2013KB)  Export:  BibTeX | EndNote (RIS)       Abstract  During isothermal decomposition of the supersaturated α2 phase in Ti-45%Al alloy at 950℃, the volume fractions of the decomposed γ phase and the lattice parameters of both α2 and γ phases have been investigated by X-ray diffraction. The results show that α2 phase in the primary lamellar microstructure (PLMS) is a metastable phase, and its composition should be identified by the tangency point on the common tangent of metastable α2 and γ phase free-energy curves. This composition is very important in calculation of free energy of the alloy and the driving force of discontinuous coarsening (DC). There exists transformation stress inside the original α grains at the direction perpendicular to PLMS which is a compress stress of about 50 MPa and will greatly affect the microstructure of the alloy. Key words:  Ti-Al alloy      primary lamellar structure      phase composition      phase transformation stress      Received:  18 May 1998      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/Y1998/V34/I5/538 1Kim Y-W, Dimiduk D M JOM, 1991; 43(8): 40 2Denquin A, Naka S. Acta Metall, 1996; 44: 343 3Blackburn M J.In:Jaffee R T;Promisel N E eds,Science,Technology and Application of Titanium,London:Pergamon Press, 1970: 633 4丁进军.博士学位论文,东北大学,沈阳,1996 (Ding Jinjun.PHD Dissertation,Northeastern University,Shyang 1996) 5Hayes F H. J Phase Equibliria , 1992; 13(1): 79 6Schafrik R E.Metall .Trans,1977;8A:1003 7Ramanujam R V, Lee J K, Aaronson H I. Acta Metall Matet 1992; 49: 3421 8蒋敏,李俊涛,郝士明.东北大学学报,1997(附刊):169(Jiang Min, Li Juntao, Hao Shiming.J Northeastern Uni, 1997(Suppl): 169)E [1] LI Qian, LIU Kai, ZHAO Tianliang. Rust Formation Behavior and Mechanism of Q235 Carbon Steel in 5%NaCl Salt Spray Under Elastic Tensile Stress[J]. 金属学报, 2023, 59(6): 829-840. [2] ZHANG Jinyong, ZHAO Congcong, WU Yijin, CHEN Changjiu, CHEN Zheng, SHEN Baolong. Structural Characteristic and Crystallization Behavior of the (Fe0.33Co0.33Ni0.33)84 -x Cr8Mn8B x High-Entropy-Amorphous Alloy Ribbons[J]. 金属学报, 2022, 58(2): 215-224. [3] YANG Rui, MA Yingjie, LEI Jiafeng, HU Qingmiao, HUANG Sensen. Toughening High Strength Titanium Alloys Through Fine Tuning Phase Composition and Refining Microstructure[J]. 金属学报, 2021, 57(11): 1455-1470. [4] Yu LIU, Shengwei QIN, Xunwei ZUO, Nailu CHEN, Yonghua RONG. Finite Element Simulation and Experimental Verification of Quenching Stress in Fully Through-Hardened Cylinders[J]. 金属学报, 2017, 53(6): 733-742. [5] YAN Guangzong; PENG Zhifang. An Optimization Method For Estimating Phase Compositions And Amounts In Two—Phase Nickel Base Superalloys[J]. 金属学报, 2005, 41(4): 363-368 . [6] LIU Chang; SU Yanqing; LI Xinzhong; GUO Jingjie; JIA Jun; FU Hengzhi. Microstructure evolution of Ti-(44-50)Al alloys during directional peritectic solidification[J]. 金属学报, 2005, 41(3): 260-266 . [7] L Guanglie; LIU Shunhong;CHEN Linshen; WU Hongli (Hangzhuo University;Hangzhuo 310028); LEI Yongquan; YU Jinyun; YANG Xiaoguang; WANG Qidong(Zhejiang Universiyy; Hangzhuo 310027)(Manuscript received 1995-11-27). PHASE COMPOSITION STUDY FOR ZIRCONIUM-BASED PSEUDOBINARY ZrM_2(M=Ni,Mn,Cr,V)[J]. 金属学报, 1996, 32(7): 779-784. [8] LIU Dacheng;WANG Fuhui;CAO Chunan;LOU Hanyi Institute of Corrosion and Protection of Metals; Academia Sinica; Shenyang WANG Fuhui; Laboratory of Electrochemistry;Institute of Corrosion and Protection of Metals; Academia Sinica; 110015 Shenyang. INFLUENCE OF PHASE COMPOSITION ON PITTING CORROSION RESISTANCE OF SPUTTERED LAYER OF 1Cr18Ni9Ti STAINLESS STEEL[J]. 金属学报, 1989, 25(5): 85-88. No Suggested Reading articles found! Viewed Full text Abstract Cited   Shared      Discussed