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Tensile properties and microstructure of Ti14 alloy after semi-solid forging

Transactions of Nonferrous Metals Society of China 2011年第12期21卷 2610-2616页

作者：陈永楠魏建锋赵永庆张学敏长安大学材料科学与工程学院西安710064 西安交通大学金属材料强度国家重点实验室西安710049 西北有色金属研究院西安710016

Tensile properties of a new α＋Ti2Cu alloy after solid forging at 950 °C and semi-solid forging at 1 000 °C and 1 050 °C were investigated over the temperature range of 20-600 °C. The results reveal that high strength and low ductility are obtained in all semi-solid forged alloys. Tensile properties decrease as the semi-solid forging temperature increases, and cleavage fractures are observed after semi-solid forging at 1 050 °C. The variations in tensile properties are attributed to the coarse microstructures obtained in the semi-solid alloys. It is found that the elevated semi-solid temperatures lead to more liquid precipitates along the prior grain boundaries, which increases the peritectic precipitation and formation of Ti2Cu precipitation zones during re-solidification. Recrystallization heat treatment leads to fine microstructure of semi-solid forged alloys, resulting in improvement of tensile properties.

关键词： Ti14 alloy semi-solid forging microstructure tensile properties heat treatment

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The effect of temperature on the segregation and deformation mechanism of α+Ti2Cu alloy during semi-solid forging

The effect of temperature on the segregation and deformation...

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2012年海峡两岸破坏科学/材料试验学术会议

作者： Yongna Chen Jianfeng Wei Yongqing Zhao School of materials Science and Engineering Chang'an University State-key Laboratory for Mechanical Behavior of Material Xi'an Jiaotong University Northwest Institute for Nonferrous Metal Research

The segregation behavior and deformation mechanism of Ti14,a new typical α+Ti2Cu alloy,during semi-solid forging at different temperatures were *** results reveal that temperature affect the content and distribution of liquid phase,more segregated and motivated to grain boundaries at higher temperature during the forging,which changed distribution of Ti2Cu on grain boundaries from discontinuous to *** varieties of the grain boundary morphology led to transition of deformation mechanism from plastic deformation of solid to sliding between solid ***,the macrosegregation of liquid and solid during the semi-solid forging was observed,and discussed by phenomenological model.

关键词： Titanium alloy semi-solid forging Segregation Deformation Mechanism

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RESEARCH ON semi-solid forging FOR LC4 ALLIOY

RESEARCH ON SEMI-SOLID FORGING FOR LC4 ALLIOY

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第二届半固态金属加工技术研讨会

作者： Shoujing Luo Jufu Jiang Wentong Tian. Dongdong Teng (School of Materials Science and Technology, P.O.BOX435, Harbin Institute of Technology, 150001 ,Harbin,P.R.China)

Summarywhich was hot extruded, was employed as experimental material, and SIMAmethod was used to fabricate semi-solid billet for two states of LC4 alloy (extruding state and cold upsetting after eIn the paper, LC4 commercial alloy, xtruding state). The influence of forging temperature on microstructures and mechanical properties of semi-solid forging parts has been studied systematically by semi-solid forging panzer soleplate. The results showed that the microstructure after semi-solid forging was related to the history of semi-solid billet and the post-processing. The microstructure would change a lot after the standard T6 heat treatment;the mechanical properties of semi-solid forging parts have been greatly improved due to theformation of approximately Al2MgZnCu in grain boundaries. The optimal mechanicalproperties for the two states of the alloy are up to 515MPa-570MPa for tensile strength and 5.2%-10.68%for elongation.

关键词： SIMA semi-solid forging microstructure mechanical properties.

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Grain boundary characteristics and tensile properties of Ti14 alloy after semi-solid deformation

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International Journal of Minerals,Metallurgy and Materials 2011年第5期18卷 576-581页

作者： Yong-nan Chen Jian-feng Wei Yong-qing Zhao School of Materials Science and Engineering Chang＇an University Xi＇an 710064 China State Key Laboratory for Mechanical Behavior of Materials Xi＇an Jiaotong University Xi＇an 710049 China Northwest Institute for Nonferrous Metal Research Xi＇an 710016 China

The microstructure and room-temperature tensile properties of Ti14,a new α＋Ti2Cu alloy,were investigated after conventional forging at 950°C and semi-solid forging at 1000 and 1050°C,*** show that coarse grains and grain boundaries are obtained in the semi-solid *** coarse grain boundaries are attributed to Ti2Cu phase precipitations occurred on the grain boundaries during the *** is found that more Ti2Cu phase precipitates on the grain boundaries at a higher semi-solid forging temperature,which forms precipitated zones and coarsens the grain *** tests exhibit high strength and low ductility for the semi-solid forged alloys,especially after forging at 1000°*** analysis reveals the evidence of ductile failure mechanisms for the conventional forged alloy and cleavage fracture mechanisms for the alloy after semi-solid forging at 1050°C.

关键词： titanium alloys semi-solid forging grain boundaries tensile properties fracture

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