一、前言 我厂某产品尾翼片,材料为LC4铝合金板,原料厚度为8mm,每面约有0.15mm的纯铝层。要求淬火人工时效热处理,处理后的机械性能要达到:σ_b≥490Mpa,σ(?)≥422Mpa,δ_5~-≥6％。1985年2月生产中发现合格品中有软货(硬度低,强度达不到指标要求),因而使4万多件货定为疑问品,不能用于生产。后经原因分析,主要是此件 First, the foreword I plant a tail piece of products, materials for the LC4 aluminum alloy sheet, raw material thickness of 8mm, each about 0.15mm of pure aluminum layer. Requires quenching artificial aging heat treatment, mechanical properties after treatment to achieve: σ_b ≥ 490Mpa, σ (?) ≥ 422Mpa, δ_5 ~ -≥6%. February 1985 found in the production of soft goods in soft goods (low hardness, strength below the target requirements), so that more than 40,000 pieces of goods as a questionable product, can not be used for production. After the analysis of the reasons, mainly this