铜模铸造Cu_(99)Zr_(0.5)Al_(0.5)合金微观组织及时效工艺  

Microstructure of Copper Mold Casting Cu_(99)Zr_(0.5)Al_(0.5) Alloy and Its Aging Treatment

作　　者：蒋鑫[1] 周秉文[1] 殷实鉴 亚斌[1] 孟令刚[1] 张兴国[1] 

机构地区：[1]大连理工大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2016年第5期552-555,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51301029;51375071)

摘　　要：采用铜模铸造制备了直径为20mm的Cu_(99)Zr_(0.5)Al_(0.5)合金棒,研究了其铸态和冷轧态组织以及时效温度和时间对其电导率及力学性能的影响。结果表明,Cu_(99)Zr_(0.5)Al_(0.5)铸态合金由细小的等轴晶粒组成,晶界处存在少量共晶组织,冷轧后晶粒在轧制方向上被压扁、拉长,形成条带状变形组织。在不同时效温度下,合金硬度(HV)随时效时间的延长先增加后减小,而电导率随时效时间的延长先迅速增大后趋于稳定,经过450℃×1h时效后,硬度(HV)达到172,抗拉强度为460MPa,电导率为34.86 MS/m。Cu（99）Zr（0.5）Al（0.5）alloy rods with a diameter of 20 mm was prepared by copper mold casting method,and effects of aging time and temperature on electrical conductivity and mechanical properties of Cu（99）Zr（0.5）Al（0.5）alloy were investigated,meanwhile,as-cast and cold-rolled microstructure of the alloy were observed.The results reveal that the Cu（99）Zr（0.5）Al（0.5）alloy is composed of fine,equiaxed grains and a few eutectic phases near the grain boundary.The grains are stretched and changed into banded structure after cold rolling.The Vickers hardness is increased firstly and then decreased with the increase of the aging time,while the electrical conductivity of the alloy is increased quickly at the initial stage and then tended to be stable.The optimized properties of Cu（99）Zr（0.5）Al（0.5）alloy were obtained under 450 ℃×1haging treatment with a Vickers hardness of 172,tensile strength of 460 MPa and electrical conductivity of34.86 MS/m.

关 键 词：铜模铸造 冷轧 电导率 硬度 抗拉强度 

分 类 号：TG166.2[金属学及工艺—热处理] TG146.11[金属学及工艺—金属学]