112學年材料所-第四週 專題研討課程演講公告 (112年10月5日)
2023.09.28
112學年上學期 材料所專題研討課程 公告
題目：
新世代輕量富鈦中熵合金的異質結構及超高機械性質的開發
Development of novel lightweight Ti-rich medium entropy alloys with hetero-structure and ultrahigh mechanical properties
主講人：鄭憲清 博士
現職：國立中央大學 機械工程學系 特聘教授兼貴儀中心主任
學歷：North Carolina State University, Department of Materials Science
and Engineering, PH.D
時間：112年 10月 05日(四) 下午 3:10 – 5 :00
地點：成功大學成功校區三系館 鋼構區(3F)共同教室A1302演講廳
演講摘要：
Lightweight titanium-rich medium-entropy alloys (MEAs) have great potential in the aerospace and automotive industries due to their low density and excellent material properties. In order to reach the light weight purpose with density comparable to commercial Ti alloys (~ 5 g/cm3), therefore, only limited elements were selected. Accordingly, a nonequiatomic quaternary alloy system, Tix(AlCrNb)100-x (x = 45–80), was firstly designed through the calculation of phase diagrams (CALPHAD). All of these as-cast alloys exhibited a single BCC structure with high yield strength and high plasticity (more than 30% plastic strain) at room temperature. Moreover, the Ti65 alloy demonstrated tensile elongation of up to 32% plastic strain and ultimate tensile strength of 1200 MPa after homogenization treatment for 24 h. Based on the solid solution strengthening concept, this quaternary Ti65 base alloy was modified by adding V and Zr elements to extend into quinary and hexamerous alloys. Then follow a series thermomechanical treatment, the final Ti-rich MEAs can obtain a hetero-structure and reach a superior synergy of mechanical properties and ductility, 1350MPa yielding strength and 15% elongation, the specific yielding strength can reach up to 270 MPa‧g/cm3.
題目：
新世代輕量富鈦中熵合金的異質結構及超高機械性質的開發
Development of novel lightweight Ti-rich medium entropy alloys with hetero-structure and ultrahigh mechanical properties
主講人：鄭憲清 博士
現職：國立中央大學 機械工程學系 特聘教授兼貴儀中心主任
學歷：North Carolina State University, Department of Materials Science
and Engineering, PH.D
時間：112年 10月 05日(四) 下午 3:10 – 5 :00
地點：成功大學成功校區三系館 鋼構區(3F)共同教室A1302演講廳
演講摘要：
Lightweight titanium-rich medium-entropy alloys (MEAs) have great potential in the aerospace and automotive industries due to their low density and excellent material properties. In order to reach the light weight purpose with density comparable to commercial Ti alloys (~ 5 g/cm3), therefore, only limited elements were selected. Accordingly, a nonequiatomic quaternary alloy system, Tix(AlCrNb)100-x (x = 45–80), was firstly designed through the calculation of phase diagrams (CALPHAD). All of these as-cast alloys exhibited a single BCC structure with high yield strength and high plasticity (more than 30% plastic strain) at room temperature. Moreover, the Ti65 alloy demonstrated tensile elongation of up to 32% plastic strain and ultimate tensile strength of 1200 MPa after homogenization treatment for 24 h. Based on the solid solution strengthening concept, this quaternary Ti65 base alloy was modified by adding V and Zr elements to extend into quinary and hexamerous alloys. Then follow a series thermomechanical treatment, the final Ti-rich MEAs can obtain a hetero-structure and reach a superior synergy of mechanical properties and ductility, 1350MPa yielding strength and 15% elongation, the specific yielding strength can reach up to 270 MPa‧g/cm3.