所属单位：

冶金工程学院

发表刊物：

RARE METALS

关键字：

中文关键字：ECAP；搅拌摩擦焊；镁合金；晶粒细化；机械性能，英文关键字：equal channel angular pressing ;

摘要：

Equal channel angular pressing (ECAP) is an effective thermo-mechanical process to make ultrafine grains.An investigation was carried out on the friction stir welding (FSW) of ECAPed AZ31 magnesium alloys with a thickness of 15 mm.For different process parameters,the optimum FSW conditions of ECAPed AZ31 magnesium alloys were examined.The basic characterization of weld formation and the mechanical properties of the joints were discussed.The results show that the effect of welding parameters on welding quality was evident and welding quality was sensitive to welding speed.Sound joints could be obtained when the welding speed was 37.5 mm/min and the rotation speed of the stir tool was 750 r/min.The maximum tensile strength (270 MPa) of FSW was 91% that of the base materials.The value of microhardness varied between advancing side and retreating side because of the speed field near the pin of the stir tool,which weakened the deformed stress field.The value of microhardness of the welding zone was lower than that of the base materials.The maximum value was located near the heat-affected zone (HAZ).Remarkable ductile character was observed from the fracture morphologies of welded joints.

备注：

袁守谦

合写作者：

王训宏

第一作者：

袁守谦,张兵

论文类型：

期刊论文

卷号：

卷：27

期号：

期：4

页面范围：

页：1532-1537

是否译文：

否

发表时间：

2008-08-01