The effect of different refining processes on inclusions and mechanical properties of cast Al-2Li-2Cu-0.2Zr alloy was investigated, including two-stage hexachloroethane (C2Cl6) refining process, two-stage rotating gas...The effect of different refining processes on inclusions and mechanical properties of cast Al-2Li-2Cu-0.2Zr alloy was investigated, including two-stage hexachloroethane (C2Cl6) refining process, two-stage rotating gas bubbling refining process and two-stage composite refining process. It was found that the two-stage composite refining process, which combined C2Cl6 and rotating gas bubbling, can significantly improve the melt purity and mechanical properties of cast Al-2Li-2Cu-0.2Zr alloy. Compared to the unrefined alloy, the volume fraction of gas porosity defects and slag inclusions decreased from 1.47% to 0.12%, and the yield strength, ultimate tensile strength and elongation of as-quenched alloy increased from 113 MPa,179 MPa and 3.9% to 142 MPa, 293 MPa and 18.1%, respectively. C2Cl6 was first utilized to degas and remove large size slag inclusions before lithium addition, and then the rotating gas bubbling was utilized to do the further degassing and remove the suspended fine inclusions after lithium addition. The two-stage composite refining process can take advantage of two methods and get the remarkable refining effect.展开更多
用Van der Pauw法研究了熔体外延(ME)法生长的截止波长为12μm的InAs0.04Sb0.96单晶电学性质,测量了其电学性质随温度的变化,结果为:300 K时,n=2.3×1016cm-3,μ=6×104cm2/Vs;200K时,n=1×1015cm-3,μ=1×105cm2/Vs。...用Van der Pauw法研究了熔体外延(ME)法生长的截止波长为12μm的InAs0.04Sb0.96单晶电学性质,测量了其电学性质随温度的变化,结果为:300 K时,n=2.3×1016cm-3,μ=6×104cm2/Vs;200K时,n=1×1015cm-3,μ=1×105cm2/Vs。分析了石墨舟和石英舟中生长的外延材料不同的电学特性及其散射机理。结果表明,电离杂质散射控制所有样品在低温时的电子输运过程,而高温时材料的电子迁移率主要由极性光学声子的散射过程决定;C的沾污对石墨舟中生长的InAs0.04Sb0.96单晶在200 K以下的电子迁移率有明显的影响。展开更多
基金Project(2016YFB0301003)supported by the National Key R&D Program of ChinaProject(51871148)supported by the National Natural Science Foundation of ChinaProject(sklmmc-kf18-02)supported by Open Research Fund of the State Key Laboratory of Metal Matrix Composites,China
文摘The effect of different refining processes on inclusions and mechanical properties of cast Al-2Li-2Cu-0.2Zr alloy was investigated, including two-stage hexachloroethane (C2Cl6) refining process, two-stage rotating gas bubbling refining process and two-stage composite refining process. It was found that the two-stage composite refining process, which combined C2Cl6 and rotating gas bubbling, can significantly improve the melt purity and mechanical properties of cast Al-2Li-2Cu-0.2Zr alloy. Compared to the unrefined alloy, the volume fraction of gas porosity defects and slag inclusions decreased from 1.47% to 0.12%, and the yield strength, ultimate tensile strength and elongation of as-quenched alloy increased from 113 MPa,179 MPa and 3.9% to 142 MPa, 293 MPa and 18.1%, respectively. C2Cl6 was first utilized to degas and remove large size slag inclusions before lithium addition, and then the rotating gas bubbling was utilized to do the further degassing and remove the suspended fine inclusions after lithium addition. The two-stage composite refining process can take advantage of two methods and get the remarkable refining effect.
文摘用Van der Pauw法研究了熔体外延(ME)法生长的截止波长为12μm的InAs0.04Sb0.96单晶电学性质,测量了其电学性质随温度的变化,结果为:300 K时,n=2.3×1016cm-3,μ=6×104cm2/Vs;200K时,n=1×1015cm-3,μ=1×105cm2/Vs。分析了石墨舟和石英舟中生长的外延材料不同的电学特性及其散射机理。结果表明,电离杂质散射控制所有样品在低温时的电子输运过程,而高温时材料的电子迁移率主要由极性光学声子的散射过程决定;C的沾污对石墨舟中生长的InAs0.04Sb0.96单晶在200 K以下的电子迁移率有明显的影响。
