The microstructure and thermal characteristics of Mg-36%Ga,Mg-43%Ga,and Mg-45%Ga(wt%) alloys were investigated.The experimental results show that the microstructure of Mg-36%Ga alloy is mainly composed of primary a-Mg...The microstructure and thermal characteristics of Mg-36%Ga,Mg-43%Ga,and Mg-45%Ga(wt%) alloys were investigated.The experimental results show that the microstructure of Mg-36%Ga alloy is mainly composed of primary a-Mg phase and a-Mg+Mg_(5)Ga_(2) eutectic phase,the microstructure of Mg-43%Ga alloy is mainly composed of a-Mg+Mg_(5)Ga_(2) eutectic phase,and the microstructure of Mg-45%Ga alloy is mainly composed of primary Mg_(5)Ga_(2) phase and a-Mg+Mg_(5)Ga_(2) eutectic phase.The melting enthalpies of Mg-36%Ga,Mg-43%Ga,and Mg-45%Ga are 146.41,171.90,and 113.90 J/g,with the phase change temperature of 422.57,422.70,and 422.90 ℃,respectively.Mg-43%Ga alloy contains the highest melting enthalpy because of the highest content of a-Mg+Mg_(5)Ga_(2) eutectic phase.In addition,the thermal expansion of the three alloys increases with increasing temperature,while the thermal diffusivity and thermal conductivity decreases with increasing content of Ga.展开更多
基金Funded by the 2019 Scientific and Technological Innovation Major Project of Hubei Province(No.2019AAA031)。
文摘The microstructure and thermal characteristics of Mg-36%Ga,Mg-43%Ga,and Mg-45%Ga(wt%) alloys were investigated.The experimental results show that the microstructure of Mg-36%Ga alloy is mainly composed of primary a-Mg phase and a-Mg+Mg_(5)Ga_(2) eutectic phase,the microstructure of Mg-43%Ga alloy is mainly composed of a-Mg+Mg_(5)Ga_(2) eutectic phase,and the microstructure of Mg-45%Ga alloy is mainly composed of primary Mg_(5)Ga_(2) phase and a-Mg+Mg_(5)Ga_(2) eutectic phase.The melting enthalpies of Mg-36%Ga,Mg-43%Ga,and Mg-45%Ga are 146.41,171.90,and 113.90 J/g,with the phase change temperature of 422.57,422.70,and 422.90 ℃,respectively.Mg-43%Ga alloy contains the highest melting enthalpy because of the highest content of a-Mg+Mg_(5)Ga_(2) eutectic phase.In addition,the thermal expansion of the three alloys increases with increasing temperature,while the thermal diffusivity and thermal conductivity decreases with increasing content of Ga.
